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Gussets provide strength and support to the top flange
Internal and external cooling fins
Open lifter valley improves oil return to pan
High rpm (above 4
Note: Some VP44 equipped trucks may exhibit a slight lope at idle due to the nozzle design utilized
2007.5-2010 Duramax 4" Downpipe Back Dual Exhaust No Muffler (431008) 5.3L Gussets provide strength and support2007. 5 2010 Duramax 4" Downpipe Back Dual Exhaust No Muffler (431008) 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!