Sharing my experience. I have a stock 07 SRT8 , only reso delete for sound. I put in the long k&n intake kit, the one that goes all the way into the wheel well....After driving 1 week here is what I noticed. Sound is amazing, i think I feel more power at high rpm, not sure thou,might be my head, but i defenetly lost that quick 1st gear response at launch. It felt like it was esitatating for a second then pick up and go. So today I out back the stock intake system and response is back. Was it in my head or an aftermarket intake without tune lower performance?