Exhaust advice

[2sikk]

I recently bought a 2004 F250 6.0 Harley truck. The previous owner did AST head studs, egr delete, Banks oil cooler, Air intake, Edge touch screen programmer, and some sort of a dual exhaust set up. I want to go to a single and i'm not sure to go 4"or 5" and what brand. Also, what size down pipe should I get? First diesel I've ever owned, so i'm going to have questions.

[PGreenSVT]

If it has duals you should be able to change it to a single just by replacing the Y pipe after the muffler with a piece of matching pipe. No sense in replacing everything.

[Int.Tech04]

on my 04 6.0, im running the stock downpipe, with a 4" from the dowpipe to a 5" tip. its sounds wicked but is reserved at part throttle and cruising. id just have an exhaust shop swap it to a single behind the rear tire with a nice tip.