I got Borla Headers, dual 2 1/2" to a X pipe to two high flow cats to a 2 1/2" Gibson muffler with two in and two 3" out, going on each side with SS 3 1/2" tips. Sounds nice and deep, thanks to the X pipe. That equalizes the pressure and sound. No Jap Crap sound here. I'm thinking of pulling the cats out, but I do not want the truck to be to loud.