having owned a 4g63 car and now a few different LS based cars, I can say that I would drive either. back in college, my brother and I use to run our 90 eclipse awd turbo with no cat and a borla turbo muffler and it was quiet as a mouse in regular driving. You only got a hint of the sound after you get on it a bit. I'm a big fan of the Borla mufflers and they do an incredible job of quieting down the car.