Flowmaster Force II Cat-Back Exhaust System For 2004-2008 Ford F-150 4.6L/5.4L 1988-1991 BMW M3 The OEM Duramax cast-aluminum cylinder

The OEM Duramax cast-aluminum cylinder heads fall short over time - the different heat expansion rates between cast-iron engine block and cast-aluminum cylinder head cause head gasket scrubbing and eventually blown head gaskets

Meeting Snell M2020 and DOT safety ratings

Provides the ability to relocate the rear axle back up to 1”

It offers superior fuel filtration and flow

Black e-coated U-bolts resist corrosion and wear issues

Flowmaster Force II Cat-Back Exhaust System For 2004-2008 Ford F-150 4.6L/5.4L 1988-1991 BMW M3 The OEM Duramax cast-aluminum cylinderThe Force II system is the perfect choice for the person who wants a subtle custom appearance with all the benefits and sound that a Flowmaster single cat back exhaust provides. The system delivers a moderate exterior tone and mild to moderate interior tone over the factory exhaust and ideally suited for customers looking for efficiency improvements without a lot of noise. This Force II system is a bolt on system and bumps the tubing size up to a 3