I just installed this exhaust on my car and has some problems. This might help if anyone else comes across this. It had me stumped for a while.

Anyways, I installed it and everything went smooth. Took about 2 - 3 hours after having some problems with the hangers but nothing big. Everything was great. Drove off and was perfect. Well about a few days later there was this rattling. happend when I was going slow and very slowly accelerating. So I put it on the lift and noticed that the rear right exhaust pipe was touching a bolt near the right rear axle (minds drawing a blank on exactly what it was touching). We loosened the entire thing and tried to pull it down and re tighten. Nothing happend. The solution we found on the brace for the cats. The hole for the bolt isn't circle but oval and if you loosen the bolts and pull it down as much as u can it seems to fix it. Now it's been about 5 days or so and no rattling has returned so if you come across this problem or if your installing this you might want to look into this before taking it off the lift.

Hope this helps someone out. (if it wasn't already mentioned before)