Join Date: Mar 2007
Location: Corona, California
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There is no best, it depends on what you want your truck to sound like. Do a search on youtube and see which one you like better. I'd recommend getting a 3.5" downpipe; if you are planning on getting a turbo and injectors get a 4" downpipe.
My 06 has a 4" turbo back that's straight piped and sounds great. It is loud anytime over 2500 rpm but cruising down the freeway you hardly know it's there.
2006 F-250 Crew Cab XLT long bed FX4, 6.0L auto.
Innovative Tuned SCT, ARP head studs, Spearco Intercooler, FASS fuel system, 4" Exhaust, Intake elbow, AFE stage 2 XP intake, DiPricol gauges, PML trans pan, CCV reroute, Zoodad mod, Train horns