Yes, they pretty much stay quiet the whole time... my brother's 2012 was super quiet until he did his borla atak axle back. (Around 10k miles, if I remember right)
Honestly, I know you said before you would leave ALL vehicles stock from now on, but the borla atak makes it sound like it should. A bit deeper and louder, but still quiet enough cruising that you can drive 24 hours at a time and not notice the exhaust. Even in ECO, unless you REALLY listen for it.
I agree that it is quieter than the wk1 stock to stock... I would recommend you breaking your "stock only" policy just this once
Install took literally 20 minutes with a floor jack.
The choice is yours, enjoy the new ride
2010 SRT8: BT Catch can, Carbon Fiber Shorty Ant., LMI Carbon Fiber CAI, Custom painted headlights/side moldings, Passport 9500ix Corvette mounted and direct wired, LED interior, Weathertech floor liners, Trinity w/vent mount, JOHAN TUNE!
Oh, and a 1988 Wrangler...