Hey, I've got a buddy with a 2005 siverado. He dropped a 6.0L in it. Has full bolt on's, a Texas Speed 224/224 cam, and a 100 shot (about to be 150)
We looked at that flow chart for the exhausts and saw where 350-400ci with 250-550hp needs a 2.5-3.0" exhaust for duals. He has Pacesetter headers with their y-pipe right now and wants to switch to duals with an x-pipe. So with his mods do you think he'd be fine with dual 2.5" or would he be better off with dual 3" with the x-pipe considering he's making around 400rwhp on motor and should be around 550 at the wheels on the 150 shot.
Thanks