2003-2007 Powerstroke 6.0L Aluminized 4" Cat Back Exhaust w/ Muffler (421108)2003 2007 Powerstroke 6. 0L Aluminized 4" Cat Back Single w Muffler (421108) 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!

9L Custom Dual Feed Injector Set (DDP9498-DF)

View Average Injector Flow Data

added performance

50MM (224-3851WR0

Its important to note that a running change  has been implemented on these filters to improve their filtration and water removing efficiency

25MM - Reduced Compression (224-3985WR-0

causing reversion—the reintroduction of exhaust gases into the cylinder on the intake stroke

Sold as a matched set with no core charge and no race/custom injector form required

Overall peak power is also improved

Whether you’ve blown out the weak factory bellow on your passenger side up-pipe or you're finishing an EGR service on your 2001–2016 Duramax

or the valve can fail and cause exhaust gas to be constantly pushed back into your engine

and price are unbeatable - not to mention it's made right here in Canada