"We also cut up the AMS front pipes to insert cats" So you must have used 3'' cats then, and if so how did you go for tunnel clearance/ road clearance. I went 3'' pipe from the dp's to 3'' cats, back to 2.5'' center muffler, then 2.5'' to rear mufflers. Problem is the cats sit low(exhaust shop did the work) because there's f/a room in the tunnel when there side by side, and because of that the whole exhaust is lower than normal, cant put the tunnel support bracket on, the only up side is that it sounds incredible. I have a pair of those ams front pipes, I may use them when my tig welding improves. Major hijack, soz harts.