Unless your going to be running serious hp 5in is over kill. As for the single or dual exit its up to you. I went with the dual kit myself. Buddy has the single and wants to switch to the dual like mine. MBRP
Turbo back Cool dual all stainless steel. Plus I can blow smoke on two lanes at once.
05' F-250, Harley Davidson #2993, True Blue
SCT X2 programmer (innovative tuned), MBRP 4in turbo back SS Cool Duals, Gutted Cat, S&B cold air intake, 2" front 1" rear lift, 325x60x20 Nitto Terra Grapplers, Stock Harley 20" rims, Line X, 20% tint all around, Alpine Linear Sub system, 4k Sylvania Silver Star lights, Zoo Dad mod, line of fire by Recon, ARP head studs, RCD EGR delete, new heads, new Turbo, dual bilstein steering stabilizers, bilstein 5100 shocks all 4 corners, truxedo bed cover, Amsoil. U.S.C.G