Originally Posted by Spartan 1771

First off, you have to remember that I installed this system with a set of Berk high flow cats, so my setup is most likely different from yours and most others in here. I've also done a lot of other bolt-ons in the past few months. With that being said, I had a rough idle and some cat rasp right after install. Both of those have subsided over the past 300+ miles I've put on the car. The idle is now a nice low even rumble. It sounds very V8ish. Under WOT it still screams, but in my opinion, it sounds damn close to a GT track car (it's awesome!). During normal driving it's still noticeable, but not as loud as it was immediately after install. It's either broken in, or I'm just going deaf. Or maybe a combination of both! Now I just need to get a tune.