2001-2007 Duramax 4" Downpipe Back Exhaust w/ Muffler (431107 / 432107) LLY

2001-2007 Duramax 4" Downpipe Back Exhaust w/ Muffler (431107 / 432107) LLY2001 2007 Duramax 4" Downpipe Back Exhaust w Muffler (431107 432107) 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 Mel's system. For powerhouse performance, Mel's delivers horsepower you can hear!

Consistent Valve Timing: With less flex

PPE has designed a superior filter for the 68RFE transmission

High-Performance Sealing for extreme horsepower and boost levels

45″ Steel Tappets provide the strength and consistency your engine demands

This feature allows you to drain all of your oil pan’s dirty engine oil

7L Standard Output Injector: Brand New Stock power level injector - SINGLE

2011-2016 Duramax LML Dynomite Diesel Brand New Injector 20% Over (DDPNLML-50)

2006-2007 Duramax LBZ PML Reman Cylinder Head Set of 2 (CH66D-LBZ-06-07)

63 LPM Nozzle Flow

and injector opening pressure set to 270 BAR by a qualified professional

Restore factory performance to your Powerstroke diesel with the Alliant AP64900 Injectors

Conical Shape for Stability: The latest spring design improves harmonic damping