im sorry but if you pay 600 bucks a fugin cat back ur insane i got my truck 2 glass packs originaly True dualed for 150bucks at a muffler shop...or if someone wants to put a 40 on i have a flowmaster from the thunder something package for the hemis ill sell ya u can take that to a muffler shop have em put it on with duals after it for extremely cheaper than that....its a 1in 2.5 up to 3in inlet on muffler with dual 2.5 exiting