i said screw the cat back system and just got a flowmaster 40 single in dual out welded up with dumps out the back for 140 and now i regret it. i should have poped for the true dual set up. now i have found myself in the market for two flowmaster single in single out super 44's and having to eat the 140 i payed for my current muffler. My truck is outflowing my current setup. itll haul but as it sits now, but i think there is more power to be had with the dual set up.