Join Date: May 2007
Location: WPB Florida
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The 108 MM (4.25) works best. We take and cut the Cat so the 108 MM pipe slides through the cat and then re-weld. We also recommend the Volant air intake because it is 100% cold air. Also cutting the header panel and installing a screen ahead of the intake. Both of these will help with mpg. You have the best stock gear for mpg. Pen to paper and not a dash computer is best for calculating mpg. It never lies. I'm sorry but all this cost money but should help. If you are like me 75 MPH will never happened.
2013 Ford F350 4X4 6.7 Powerstroke. 3:55 Gears Electronic Locker. Mods - Full Delete, H&S Mini Max Running SPE HotX, S&B Cold Air Intake, SPE Electric Axle Lock, H&S CAC Tube Mod,
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