Just wanted to say that I put on my aftermarket downpipe and no snags or anything. It fit right up to the exhaust and manifolds. You have to put it on like a wheel. Each nut has to be tightened a little and then move to the next one. I can feel the difference, it's hard to explain, but it definately feels different and sounds a little more throaty. I guess it feels like it punches more. The only problem I had was with the damn O2 sensor which had to be removed with an air wrench while trying to stretch the stupid 4 inch wire. The other problem I had was that I didn't have a lift, I had to use jack stands. I suggest using a 6" extension for the air tool and perhaps a little PB blaster if your nuts don't come off, but I didn't need it. You need a 17mm and 19mm socket. Other than that, have fun, it's fairly rewarding. Oh, and always replace the old gaskets with new ones. Anybody have questions, just ask. My two cents is done.