By great truck on
Vehicle2008 Ford F-350 Super Duty XL 4dr Crew Cab SB (5.4L 8cyl 6M)
Reviewi have 7000 miles on the 6.4. it has lots of power. anyone that owns one get a 4 inch ext. tuner and you will not have any problems. the reason some are is that these engines r so restricted back because of the govt these engines need to breath just like us and their not letting them. dont believe me go buy a 08 dodge cummins its having the same problems. so its not ford dodge or chevy. these engines produce so much horse power and torque that with resrtictions its hurting more than helping. so what im saying is help out your engines.. i deal w them everyday look at the engine prior to 2003 and they all era great thats because govt. wasnt involved
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