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Flat tappet lifters do not need it
3L High Flow Exhaust Outlet Flange (300161)
if you do not surface the block
6L Duramax turbo actuator has a very low failure rate in the field
2001-2016 Duramax Flywheel Bolt Kit (230-2801)
2013-2018 Cummins 6.7L 4" Downpipe Back Single w/ Muffler (411018 / 412018) 2007.5 - 2009 Dodge Turbochargers Flat tappet lifters do not2013 2018 Cummins 6. 7L 4" Downpipe Back Single w Muffler (411018 412018) Constructed out of 16 gauge aluminized steel or T409 Stainless, this exhaust system is designed to simplify installation with included clamps, preweld contour bends and improved flanges. Enjoy a noticeable boost in performance, lowered EGTs and amplified air flow with this Flo~Pro system. For powerhouse performance, Flo~Pro delivers horsepower you can hear!