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It varies from engine to engine.
Doesn't seem to help VW TDI engines.
It helps Ford 6.0 and 6.4 engines a lot as it does the Cummins 24 valve.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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