2011-2015 Duramax LML P1 4" Downpipe Back Exhaust w/ Muffler (C6044304)2011 2015 Duramax LML P1 4" Downpipe Back Exhaust w Muffler (C6044304) Maximize performance in your race built 2011 2015 GM 6. 6L Duramax with the P1 Performance Products C6044304 4" Pro Series Downpipe Back Competition Exhaust. The Pro Series is built from T304 stainless steel that offers unbeatable durability. The P1 Performance Products Pro Series is built for those that don't want to compromise on their exhaust system.

The cold side tube is a 3" mandrel-bent pipe that minimizes turbulence and maximizes airflow

9L with the 224-3523WR Piston with Rings

ensuring optimal performance and preventing leaks under high compression

BD Diamond Bite Shims with a diamond embedded electroless nickel coating create a micro-bite between the flexplate surfaces giving a significant friction increase

0L Cummins 1500

An air compressor is included in most kits for newer pick-up trucks

9L 75HP Injector Nozzle Set (DDPISB-75NZ)

Extreme duty pushrods (oem-2000 hp)

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

50MM Piston With Rings

Longer injector lifeEasy replacement

Proudly made in the USA from industrial-grade polymer