2001-2007 Duramax 5" Downpipe Back Exhaust w/ Muffler (531100)2001 2007 Duramax LB7 5" Downpipe Back Exhaust w Muffler (531100) 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!

Our most popular selling injector set due to it's mix of excellent fuel economy

The wastegate flange is fully divided to the wastegate valve face preserving the twin scroll effect perfectly

towing as well as heavy-duty performance needs

9L Diesel with OEM quality pistons when you purchase the MAHLE 224-3520WR Piston With Rings (Standard)

Install an ARP 250-4203 Diesel Head Stud Kit from OCDiesel and upgrade your 2008-2010 Ford 6

Cast from the same hi-sil moly as PPE’s High Flow Race Exhaust Manifolds

PPE’s Heavy-Duty DEEP Transmission Pans hold an extra 4 quarts of fluid and are cast from high-strength aluminum for optimal heat dissipation

These head studs have a much higher strength and will not stretch like the factory bolts will

If you’re looking for the quickest spool and the widest rpm band of all of our cams

020 (224-3451WR

quicker spool

you will need to modify the turbo intake boot and down-pipe for proper fitment**