Hey guys, i want to install the flowmaster series 80 on my fx35 2006 AWD, and im looking on amazon/ebay but there are so many diff types with dif specs, some are dual, 2 pipes in and 2 pipes out, and some have 1 pipe on one end and 2 out the other.. also some are 3" in and 2.5" out and some are 2.5" in and 2.5" out, i saw a couple fx35'ers here with that muffler also on youtube. i was wondering if anyone knew which one they had installed? thanks! :eek.: