GM/Chevy Duramax LML Downpipe | 2011-2016

The LML Duramax Downpipe for the 2011–2016 GM/Chevy Silverado and Sierra opens up exhaust flow right where it's most restricted, at the turbo outlet. If your LML is running a delete tune or building for competition, this is the first pipe that needs to change.

The factory downpipe was designed around emissions packaging, not airflow, which creates turbulence and backpressure exactly where your turbo needs to spool freely. That means slower throttle response, higher EGTs, and power left on the table. This downpipe clears that out with a full 3" diameter, 20% more flow than the OEM pipe.

It's a direct bolt-on replacement for the factory downpipe, built from 3" stainless steel for a part that outlasts the truck with no rust or corrosion. It comes with the downpipe, included heat-wrap to keep engine bay temperatures in check, and the required clamps and hardware. Worth knowing: this downpipe does not affect emissions systems, so your DPF and EGR stay untouched and no tune is required to run it. It's built for maximum flow on competition applications, and the faster spool, lower EGTs under load, and added airflow for power are what you get out of it.

It fits 2011, 2012, 2013, 2014, 2015, 2015.5, and 2016 Silverado 2500/3500 and Sierra 2500/3500 pickups with the 6.6L LML Duramax. It does not fit Cab & Chassis trucks. For 2015, check the turbo outlet: a V-band clamp means select 2011–2015, and a 3-bolt flange means select 2015.5–2016, so look at the product images to confirm.

No welding required, and free shipping is included with a 30-day return policy on unused parts.