I'm getting my Bully Dog this week (I hope) in the mail. I was talking to the salesman and he told me that I really need to at least change to a 4" exhaust. I can't see a benefit in going from the 3.5" on my 03. My Aeroturbine and muffler are 4", so I would only have to change the pipe.

My EGTs run in the 4-500 range cruising down the hwy at 75mph, no load. I assume that after I stack, they will be higher???? If I have to change pipe, will a 4" be enough?
thanks
Greg

PS, I'm running the two gauge pillar, I can't seem to find a 3 gauge for my 03. Does anyone know where I can find one? I don't like the FP gauge sitting in a single holder hanging off my dash.