Well, I can tell you it sounds pretty awesome. I found out there's no cat on my 86 GP, so I had two-inch pipes run all the way back under the bumper, chrome tips and all. The manifold pipes go straight down, so it's perfect for this. No problem clearing the brace, transmission pan, gas tank, or anything else. At idle it's ridiculously quiet. I can here burps here and there. Inside the car and I can't even hear it run. When I step on the gas though, it's a lot louder than I was expecting! I gunned it up to 80 on the entrance ramp today and it sounded like Dukes of Hazzard. Cooter would nut. This thing also has a lot more power (at least when it's floored), I got up to 80 as fast as I was getting up to 60 with it floored before. I recommend doing such a thing if you ever find out your cat is missing (and I don't mean fluffy).
