The question I have is whether those who change the exhaust are doing so simply for the guttural noise of the motor OR is there really a marked improvement in performance in switching to something else?

I ask because I don't really care about the sound the motor makes. If there is a way to get speed without additional noise, I'm totally down for that. My Viper makes so much noise you feel like you just got out of a rock concert after a long trip and I'd like something fast yet civilized in the Cherokee.

Opinions appreciated

There are little to no performance gains with an exhaust. It is done simply for sound IMO.

And sound I like. :D

Our stock suitcase exhaust is real restrictive, adding a aftermarket catback yeilds mild hp/trq gains(12-15 hp) If you want something on the performance/ somewhat quiet side check out the borla-t edition.

I don't know about some , but i gained big with the borla , plus Sounds nasty :D
Factory suitcase !!!!1

http://img63.imageshack.us/img63/9563/imga0425b.jpg (http://img63.imageshack.us/i/imga0425b.jpg/)

My BORLA :eek:

http://www.youtube.com/watch?v=j4R7ZRF38UM

the borla sounds nice, but how much of that do you hear in the cabin?

over $1000 just for sound??? I also heard you lose a bit of the pep on the low end of things with an aftermarket exhaust. hhhhmmmmmm

the borla sounds nice, but how much of that do you hear in the cabin?

The Borla S drones in the cabin in the 40-45mph range pretty good.

I've ran stock, Borla T, Borla S and now a modified stocker with QTP electric cut-outs......all in less than a year :D


As mentioned, the Borla T is quiet in the cabin. The Magnaflow Cat-back is quiet in the cabin as well.

Or if you modify the stock exhaust by swapping the muffler only and leaving the resonators in place it's pretty quiet in the cabin as well (the dual in/dual out mufflers that guys use are quieter than say two round mufflers which is what myself and a few others in the area run).

the borla sounds nice, but how much of that do you hear in the cabin?

I hear nothing but music ;)

over $1000 just for sound??? I also heard you lose a bit of the pep on the low end of things with an aftermarket exhaust. hhhhmmmmmm

Best 1k you'll ever spend hands down !!! as far as loosing power what you need to do is listen to yourself and not others , I gained Power .

I did it for SOUND!! Got the Corsa and LOVE it. My thoughts are this... you have a bad arse 6.1l Hemo under the hood, why muffle it?! It doesn't hurt that I had the extra 444 lying around so it was not a big deal.

According to some of the Mopar magazines, an improvement was shown on LX cars (Charger, Magnum, etc) via dyno runs for Catbacks. You can expect 10-15 HP.

Everyone is going to have their favorite, but from personal experience Corsa was great for me on my Charger SRT-8.

I have a daughter and sometimes have clients and/or co-workers in my car, and it gave me the best of both worlds because it sounded "normal" when driving normal, but great at WOT.

The Mopar aftermarket system is OEM'd from Corsa, so you can order it from a Jeep dealership. I liked it because it has Mopar etched on the tailpipes.

According to some of the Mopar magazines, an improvement was shown on LX cars (Charger, Magnum, etc) via dyno runs for Catbacks. You can expect 10-15 HP.

Everyone is going to have their favorite, but from personal experience Corsa was great for me on my Charger SRT-8.

I have a daughter and sometimes have clients and/or co-workers in my car, and it gave me the best of both worlds because it sounded "normal" when driving normal, but great at WOT.

The Mopar aftermarket system is OEM'd from Corsa, so you can order it from a Jeep dealership. I liked it because it has Mopar etched on the tailpipes.



cool! great info and thanks for sharing:cheers:

Theres alot of speculation, alot of personal opinion, and alot of just plain garbage out there when it comes to exhaust. From what I've read, and my experience in the past, it's all relative to other things. If you want tone, just replace the muffler. There is no reason to put a whole new exhaust system on just for tone. You can x or h pipe as well, just depends on what you wanna spend. I personally bought mine and it had had the muffler removed. In the past I've done lots of exhaust mods, some light, some extreme. My last endevour was a true dual 3" system on my 5.4 Navigator. The consensus seems to be bigger is better for more flow, but you come to a point where bigger is not better. I acutally lost 4 HP going to 3" from 2.5". You do need some back pressure for the system to work properly. Like I've said before, an engine is simply a Giant air pump. You want it to work at a good ratio of in to out. The system seems to perform rather well with the stock unit, and replacement of just the muffler will give you the sound. As for 12-15hp, I'd like to see the dyno sheets on a stock car (meaning no CAI or any other mod) vs a car with an exhuast system show that on paper. But in the end, it all boils down to what you wanna do. I myself wouldn't piss away over $1000 on an exhaust system, I'd put it into something more beneficial to power.

Can anyone substantiate any of the HP claims with before and after dyno sheets on their Jeep?
I just want to see some real proof of just an exhaust upgrade.

Can anyone substantiate any of the HP claims with before and after dyno sheets on their Jeep?
I just want to see some real proof of just an exhaust upgrade.

The only way to really do it is like the Mopar magazines did on the LX cars. Get a baseline, install the catback, and do 3 more runs all in the same day and as close together as possible. One day your car could show a low number, a high number the next. It all depends on the weather, the Dyno tech, using the exact same dyno, etc, etc, etc..... Not just the mod itself.

i agree with immo..corsa is best of both worlds.
i just put mine on less than 2 weeks ago. I had the dcx cmr tune with afe intake and i think i gained some power up top

I copied DC's setup and love the result. The Magnaflows are not much louder than stock but are considerably less restrictive. If I want loud I simply push a button on my cutout controller and the truck can wake up the neighborhood if I want. All for under $800.00 installed :D:D

Those of you that did the Magnaflows, did you leave the stock resonators or did you put in a dudal inlet/outlet Magnaflow muffler and then put in two more Magnaflows to replace the resonators? What part #'s did you use? I've been tossing this idea around for a while and just haven't committed to it. Anyone have a video/sound clip they could post with the Magnaflow muffler replacement? Thanks

Personally, I believe the stock exhaust is sufficient and an upgrade is going to yield very little if any power.

I love the sound of my CORSA as you can tell....

http://www.cherokeesrt8.com/forums/showthread.php?t=30128&highlight=Ringtone

Plus it looks nice...

http://i203.photobucket.com/albums/aa289/SRTOCHO/IMG_0161.jpg

I copied DC's setup and love the result. The Magnaflows are not much louder than stock but are considerably less restrictive. If I want loud I simply push a button on my cutout controller and the truck can wake up the neighborhood if I want. All for under $800.00 installed :D:D

I probably woke up some of your neighborhood the other night when I left with my cut-outs wide open :D



Those of you that did the Magnaflows, did you leave the stock resonators or did you put in a dudal inlet/outlet Magnaflow muffler and then put in two more Magnaflows to replace the resonators? What part #'s did you use? I've been tossing this idea around for a while and just haven't committed to it. Anyone have a video/sound clip they could post with the Magnaflow muffler replacement? Thanks

I used two 5" round Magnaflows in place of the factory muffler (Magnaflow p/n 12867) and have my stock resonators still in place. This video is with only 15 miles on the mufflers, so they have gotten louder and throatier since I took this:

http://www.youtube.com/watch?v=HKP8UWyQuIQ

$1,000 on just sound is a waste of money imo, unless im getting some sort of performance

The question I have is whether those who change the exhaust are doing so simply for the guttural noise of the motor OR is there really a marked improvement in performance in switching to something else?

I ask because I don't really care about the sound the motor makes. If there is a way to get speed without additional noise, I'm totally down for that. My Viper makes so much noise you feel like you just got out of a rock concert after a long trip and I'd like something fast yet civilized in the Cherokee.

Opinions appreciated

Install Exhuast dumps. I gained 16 rwhp when I opened the dumps on the dyno. I am not running stock exhaust and still made big gains by opening the dumps. Keep the stock exhaust for the sleeper sound and open the the dumps to kick some butt.

Install Exhuast dumps. I gained 16 rwhp when I opened the dumps on the dyno. I am not running stock exhaust and still made big gains by opening the dumps. Keep the stock exhaust for the sleeper sound and open the the dumps to kick some butt.


This is exactly what I want to do, I'm just too cheap to buy new cutouts. :)

This is exactly what I want to do, I'm just too cheap to buy new cutouts. :)

But its cheaper than any exhaust and you get the best of BOTH worlds.

Borla is the best and it sounds the best and it increases horspower....stocker exhaust is for girls....

Ok, Now close the thread!

But its cheaper than any exhaust and you get the best of BOTH worlds.

Amen! :)

Borla is the best and it sounds the best and it increases horspower....stocker exhaust is for girls....

Ok, Now close the thread!

Amen! :)

Wait, I meant STFU, Mofo. :D

Amen! :)



Amen! :)

Wait, I meant STFU, Mofo. :D



hahahaha Grip!

You knew that comment was directed at you...:D

I have the magnaflow reso delete I picked up used from a member for 100 beans, put to 5 in tips have under 300 total for the whole system. I just couldn't bring my self to spend that much money on a cat back. I am happy for now with what I got. As for performance I am stuck in the middle right now. I am currently waiting for my catch can to hopefully solve my issues with st and lt knock I have been having with my tunes. But I'm not totally convinced that oil blow by is my only issue. After I put the exhaust system on my performance went down, blowby?, loss of backpressure? Once I get my catch can I will do some more datalogging with my current set up with a few different tunes. Then once I find which tune performs best I will install my oe exhaust and do some datalogging and see whats up! Good luck with whatever way you go.

Install Exhuast dumps. I gained 16 rwhp when I opened the dumps on the dyno. I am not running stock exhaust and still made big gains by opening the dumps. Keep the stock exhaust for the sleeper sound and open the the dumps to kick some butt.

boy this really sounds like the best way to go. keep the stock for driving around, then when you're ready to kill someone open that stuff up! i like it

Borla is the best and it sounds the best and it increases horspower....stocker exhaust is for girls....

Ok, Now close the thread!

IMO AND WE ALL HAVE THEM.
LOL i guess all the jeeps i have beat with b woody cai and bolra cat back exhaust with my stock exhaust & GSM CAI was a fluke HEHE. All i can say is girls run fast lol. Next time i go racing ill have to wear a dress then lol. At my race wt Sarge 6.1 with cat back exhaust is the only 1 i havnt beat in ET and MPH and he had corsa. Unless you get a deal and i mean a deal pass on them as far power increase that i have seen is NONE just a bunch of noise.

IMO AND WE ALL HAVE THEM.
LOL i guess all the jeeps i have beat with b woody cai and bolra cat back exhaust with my stock exhaust & GSM CAI was a fluke HEHE. All i can say is girls run fast lol. Next time i go racing ill have to wear a dress then lol. At my race wt Sarge 6.1 with cat back exhaust is the only 1 i havnt beat in ET and he had corsa. Unless you get a deal and i mean a deal pass on them as far power increase that i have seen is NONE just a bunch of noise.

It's to bad you don't live on the east coast. It would be very funny watching you drag race in a dress.:D

It's to bad you don't live on the east coast. It would be very funny watching you drag race in a dress.:D

If i knew the dress and bra would get me in the 7.80s i would wear them lol.

anyone have any pictures/install notes on the dump option? I as well, want quiet when taking around clients, but want to open it when I drop them off and want to play :)

anyone have any pictures/install notes on the dump option? I as well, want quiet when taking around clients, but want to open it when I drop them off and want to play :)

I ditched the stock muffler for some magnaflows and my QTP Exhaust cut-outs are before the mufflers.

I used a QTP Y-pipe:
http://www.truckblog.com/gallery/DCSpecial/37610.jpg

And then the QTP cut-out:
http://www.truckblog.com/gallery/DCSpecial/37612.jpg


And everything installed with some custom made tips to direct the exhaust away from my fuel tank since I do have them wide open pretty often :D

http://www.truckblog.com/gallery/DCSpecial/37623.jpg

I ditched the stock muffler for some magnaflows and my QTP Exhaust cut-outs are before the mufflers.

I used a QTP Y-pipe:
http://www.truckblog.com/gallery/DCSpecial/37610.jpg

And then the QTP cut-out:
http://www.truckblog.com/gallery/DCSpecial/37612.jpg


And everything installed with some custom made tips to direct the exhaust away from my fuel tank since I do have them wide open pretty often :D

http://www.truckblog.com/gallery/DCSpecial/37623.jpg

Beautiful set up bro , Start a your won exhaust business :eek:

Beautiful set up bro , Start a your won exhaust business :eek:

I specialize in fabricating things out of stone, blocks, etc. I don't mess with metal much any more (used to make and sell custom modified bumpers a few years back, :D ).

Yep, I did A LOT of research before changing anything on stock exhaust and finally decided on the same setup DC has. I cannot be more pleased since I get the best of both worlds (nice and quiet or extremely loud). In addition, the electronic cutouts don't always have to be opened all the way up so you can adjust just how loud you want it. I have them set for 20%, 50% and 100% and each percentage provides a different sound. :D

Yep, I did A LOT of research before changing anything on stock exhaust and finally decided on the same setup DC has. I cannot be more pleased since I get the best of both worlds (nice and quiet or extremely loud). In addition, the electronic cutouts don't always have to be opened all the way up so you can adjust just how loud you want it. I have them set for 20%, 50% and 100% and each percentage provides a different sound. :D



Ken's research=asking me a million questions.


LOL :D

Ken's research=asking me a million questions.


LOL :D

Yep, and driving around in your Jeep getting numerous headaches from that Borla S and it's drone. :mecry:

If your ever going to go with forced induction or a 426 you'll need to go a less restrictive exhaust

Yep, I did A LOT of research before changing anything on stock exhaust and finally decided on the same setup DC has. I cannot be more pleased since I get the best of both worlds (nice and quiet or extremely loud). In addition, the electronic cutouts don't always have to be opened all the way up so you can adjust just how loud you want it. I have them set for 20%, 50% and 100% and each percentage provides a different sound. :D

now that's interesting. i didn't realize you could adjust how open you actually have the cutout. that's really cool. where do you have the switch in your jeep?

Yep, and driving around in your Jeep getting numerous headaches from that Borla S and it's drone. :mecry:

I thought you loved the Borla S when I had it??
LOL



now that's interesting. i didn't realize you could adjust how open you actually have the cutout. that's really cool. where do you have the switch in your jeep?

Yep, you can open them a little or all the way. He has his controller in the cubby hole next to the adjustable pedal switch.


On mine, I used a different switch and put it in place of the adjustable pedal switch :D

http://www.truckblog.com/gallery/DCSpecial/37627.jpg

^^This is awesome, I remember you tellin me about this a few weeks ago Ken. How much would a mod like this cost? Where can one find the cutouts or all the pieces of the puzzle to make it happen??

^^This is awesome, I remember you tellin me about this a few weeks ago Ken. How much would a mod like this cost? Where can one find the cutouts or all the pieces of the puzzle to make it happen??


+1 here please

What ekaz did, which I copied and then Ken copied me, LOL :

Pair of cut-outs:
http://www.summitracing.com/parts/QTP-QTEC60/

QTP Y-Pipes (need to order 2):
http://www.summitracing.com/parts/QTP-10300/

Magnaflow Mufflers:
http://www.summitracing.com/parts/MPE-12867/


The QTPs come with their own lighted toggle or you can upgrade to their digital controller:
http://www.summitracing.com/parts/QTP-10200/

I didn't used either one.


When you cut out the stock muffler the Y Pipes and Mufflers fit perfectly in its place. You need to separate the rear pipes to line up with the new setup (very easy to do).

This pic is taken looking towards the front. You can see the two Magnaflow mufflers and the Y-pipes with the shiny aluminum cut-outs on them. The black turndown/out tips are something that we made custom for my Jeep since I run with them open a lot and didn't want the hot exhaust aimed at my fuel tank.

http://www.truckblog.com/gallery/DCSpecial/37623.jpg


And what that combo sounds like with the cut-outs closed, just the sound you get from the different mufflers (only 15 miles on them in this video they have since broken in and have a throatier sound and are louder):
http://www.youtube.com/watch?v=HKP8UWyQuIQ

Install Exhuast dumps. I gained 16 rwhp when I opened the dumps on the dyno. I am not running stock exhaust and still made big gains by opening the dumps. Keep the stock exhaust for the sleeper sound and open the the dumps to kick some butt.


did you have pics of the dyno sheet?

did you lose any TQ?

those of you running cutouts do u run them off the stock manifolds or do you have headers

those of you running cutouts do u run them off the stock manifolds or do you have headers

I still have stock manifolds and stock mid-pipes.

Mine are after the stock mid-pipes.

I'm still considering this mod, just don't know about install

Install is pretty straight forward for any shop that can weld on the exhaust.

According to the SRT engineers, hemis like back pressure. Corsa claims their cat-back is designed specifically for our vehicle in concert with the SRT engineers. Marketing or not I don't know, but it's the only system for our vehicles that I know of sold by and marked "Mopar". So I gave them the benefit of the doubt. I'm assuming they kept back pressure in mind while making it a little less restrictive. It's sold through their performance division, so I don't think sound was the driving force in the design. In fact they've developed their own drone canceling tech for the system. Which works great BTW!

Seems some of the free flow setups that've been tried have seen large power drops. Which would tend to validate what the engineers said in the chat session. I think you need headers etc. for a free flow to perform best.

As to performance, what I've been told is our stock exhaust is not as restrictive as say the LX platform, so gains from a cat-back are minimal by comparison. That said, I can attest to better performance from mine. Initially I noticed a slight drop in low end, but an increase on top. A quick revision of my CMR tune and the previous low end was restored without losing the top end boost. Best of both worlds!

As to sound, it's also best of both worlds. It's as quiet as the stock system until you open 'er up. Then it sounds really mean, but still not loud enough to draw in all the local cops.

But when it comes to bang for the buck, the slight performance gain isn't worth the money, so the sound makes up for some of that disparity. A good CAI and CMR tune is definitely money better spent for performance.

As always YMMV...

wink

I have the borla s and cutouts and love both of them wouldn't change a thing

I am somewhat surprised by this thread considering the close community of SRT ownership.

Perhaps its the limited availability of 4w dyno's that is the siginificant factor here.

I cant imagine not performing a pre/post dyno on a significant mod as well tune for the mod itself.

Install is pretty straight forward for any shop that can weld on the exhaust.

You had the Borla T and S? Did you notice a difference between the two? I was thinking about getting rid of my T and getting the S, would it be worth it? Or would just replacing the tips on the T be a better option?

I was looking for something a little louder and difference tips, but haven't heard the S in person or had seen anyone that had both.

I am somewhat surprised by this thread considering the close community of SRT ownership.

Perhaps its the limited availability of 4w dyno's that is the siginificant factor here.

I cant imagine not performing a pre/post dyno on a significant mod as well tune for the mod itself.

from what i understand most dynos done on the gcsrt8 are on a 2wd setup. they get in the tcase and disengage the front. only takes them like a half hour

I noticed on the '08, when I'm in the middle of a sharp turn, mat it, if it didn't shift down to first and just lug 2nd, I would get a stumble/lag, and it would clear as soon as the rev's came up. With the Corsa it cleared that right up and pulled cleaner down low, sounded great when on the throttle. Throttle tip-in at speed "seemed" more efficient too, especially when running 90mph and over.

I'm surprised a lot of folks don't seem to know about cutouts. I have one on my 5.7L Hemi and it just sounds beastly when you gun it. Anything over 3000 rpms just sounds completely out of control.

Here's how it sounds with mild driving from inside the truck:
http://www.youtube.com/watch?v=nBqBduqzFB0

Here's from outside on a dyno:
http://www.youtube.com/watch?v=v1VGFrPSMfA

I can imagine the 6.1L sounds even more badass. The problem I had with the cutout is that after a short while, mine wouldn't fully seal anymore. Then you have either a rattle from the valve or an exhaust leak that sounds crappy. I would love to get cutouts for my Jeep but I don't want it to sound crappy if/when the cutouts stop fully closing.

Houston, what brand cuttouts where those you had problems with so I know what to stay away from?

I had QTP and DMH and both did it. I know DMH has a really good warranty though. I just never had time to screw with it to send it in, etc.

What ekaz did, which I copied and then Ken copied me, LOL :

Pair of cut-outs:
http://www.summitracing.com/parts/QTP-QTEC60/

QTP Y-Pipes (need to order 2):
http://www.summitracing.com/parts/QTP-10300/

Magnaflow Mufflers:
http://www.summitracing.com/parts/MPE-12867/


The QTPs come with their own lighted toggle or you can upgrade to their digital controller:
http://www.summitracing.com/parts/QTP-10200/

I didn't used either one.


When you cut out the stock muffler the Y Pipes and Mufflers fit perfectly in its place. You need to separate the rear pipes to line up with the new setup (very easy to do).

This pic is taken looking towards the front. You can see the two Magnaflow mufflers and the Y-pipes with the shiny aluminum cut-outs on them. The black turndown/out tips are something that we made custom for my Jeep since I run with them open a lot and didn't want the hot exhaust aimed at my fuel tank.

http://www.truckblog.com/gallery/DCSpecial/37623.jpg


And what that combo sounds like with the cut-outs closed, just the sound you get from the different mufflers (only 15 miles on them in this video they have since broken in and have a throatier sound and are louder):
http://www.youtube.com/watch?v=HKP8UWyQuIQ


Very nice set up. It really adds up fast though. Is this with or w/o resonaters??? Is there any freeway drone? How loud is it inside the truck?

Very nice set up. It really adds up fast though. Is this with or w/o resonaters??? Is there any freeway drone? How loud is it inside the truck?



I still have the stock resonators in place.

No drone, quiet inside when cruising with the cut-outs closed. You can hear in under heavy throttle with the cut-outs closed, but not too loud.

Cut-outs wide open is damn loud inside and outside under heavy throttle......but still no drone.

I know this is delayed but you mentioned the tips angling down away from the fuel tank? Im going to also be running with the cutouts open alot so im probably going to want to get something like that. Do you have a picture of them? And is this similar to what you did?
https://shop.quicktimeperformance.com/cart.php?m=product_detail&p=80

Thanks
What ekaz did, which I copied and then Ken copied me, LOL :

Pair of cut-outs:
http://www.summitracing.com/parts/QTP-QTEC60/

QTP Y-Pipes (need to order 2):
http://www.summitracing.com/parts/QTP-10300/

Magnaflow Mufflers:
http://www.summitracing.com/parts/MPE-12867/


The QTPs come with their own lighted toggle or you can upgrade to their digital controller:
http://www.summitracing.com/parts/QTP-10200/

I didn't used either one.


When you cut out the stock muffler the Y Pipes and Mufflers fit perfectly in its place. You need to separate the rear pipes to line up with the new setup (very easy to do).

This pic is taken looking towards the front. You can see the two Magnaflow mufflers and the Y-pipes with the shiny aluminum cut-outs on them. The black turndown/out tips are something that we made custom for my Jeep since I run with them open a lot and didn't want the hot exhaust aimed at my fuel tank.

http://www.truckblog.com/gallery/DCSpecial/37623.jpg


And what that combo sounds like with the cut-outs closed, just the sound you get from the different mufflers (only 15 miles on them in this video they have since broken in and have a throatier sound and are louder):
http://www.youtube.com/watch?v=HKP8UWyQuIQ

I know this is delayed but you mentioned the tips angling down away from the fuel tank? Im going to also be running with the cutouts open alot so im probably going to want to get something like that. Do you have a picture of them? And is this similar to what you did?
https://shop.quicktimeperformance.com/cart.php?m=product_detail&p=80

Thanks


Very similar to what I did, those look nice:

http://i996.photobucket.com/albums/af90/DCSpecial/QTP%20Cut-outs/Customexhaustandcut-outs004small.jpg