Magnum 5.9/Doug's headers--what diameter exhaust pipe do you reccomend?

3inch would give you room for future upgrades in power, or even 3 inch to the mufflers And 2 1/2 tail pipes. I checked around and two shops said they wouldn't do 3 inch tail pipes cause it wouldn't fit. Guess they didn't check summit, they sell 3 inch mandrel bent that includes tail pipes. My 340 dart slows down .3 in the 1/4 with the exhaust on, 2 1/2 from headers to choke master mufflers and factory 2 1/4? I think tail pipes, they were on the car when I got it.