Re: 4" or 5" Exhaust with X3 and Stock Head Bolts
4 inch is fine.
5 is just for looks and sound. There is NO performance gains/losses going from 4 to 5
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Single Cab Dually
S366 w/Irate mount and plenums, EFuel, Intercooler, P.I.S 175/80s,
Corbeau seats w 08 console, 19.5s, Black Interior with swede headliner and visors,
Custom badges, Flight Fab/DIY traction bars.
2012 CCSB F250 Ultimate Lariat.