2001-2007 Duramax 4" Cat Back Exhaust w/ Muffler (431108) L5P Race Tuning Required

Race Tuning Required

From stock to 700+ hp ground pounders

2017-2019 Duramax L5P 4" Downpipe Back Exhaust w/ Muffler (431021)

With thes PPE Left and Right Side Cylinder Head Bank Manifolds

Sold as balanced set upon completion of Custom injector waiver

2001-2007 Duramax 4" Cat Back Exhaust w/ Muffler (431108) L5P Race Tuning Required2001 2007 Duramax 4" Cat Back Exhaust w Muffler (431108) 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!