LML Downpipe Install | Watch How To Video And If It’s Worth It

The MBRP down pipe provides a smoother flow from the turbo resulting in lower EGT’s and increased performance. With all the tight quarters under the Duramax engine the LML Downpipe install can be frustrating. Looking to add power to your GM Duramax LML? See how to install a lml downpipe to maximize a turbo and lower EGTs. Check out our full install video below. An aftermarket downpipe can bolster up performance by removing those pesky turbo outlet constrictions. This downpipe by MBRP is a huge upgrade over the stock (OEM) down pipe. This pipe does not come with any new hardware and you must retain all of your stock hardware and sensors. This install is a little complicated. Pay close attention to the instructions in the video. It might even be worth a full watch before even picking up a tool. We are confident that any Diesel Addict reader can accomplish this install without much trouble if they pay attention to the details.

Information about LML Downpipes:

lml downpipe install

Looking to add power to your GM Duramax LML? Most look at the exhaust, intake, and programmer for horsepower gains. The factory turbo direct pipe is often overlooked. MBRP has addressed this problem of the constrictive factory exhaust with their new turbo direct pipe replacement. This mounts between the factory turbo and exhaust system. Features include a 16-gauge mandrel bent tubing for maximum flow and an extremely durable high-temperature ceramic coating. These downpipes deepen the sound of your diesel V8, lower exhaust gas temperature, and quickening throttle response.

The down pipe is a relatively easy install due to the precision bends that you’ve come to expect from MBRP.

Fits: 2011-2015 Chevy/GMC Duramax 6.6L LML
Part Number: GM8427


  • Greater Heat Retention
  • 20% Greater Flow Over Stock
  • Richer Diesel Sound
  • Will Not Affect Emissions (DPF or Urea System)
  • Gains of +21HP & +24 Ft-lbs.

gm8427 flow specs

Get your own LML Downpipe of your own >>shop now at Thoroughbred Diesel

The LML Downpipe Install:

The down pipe is a relatively easy install due to the precision bends that you’ve come to expect from MBRP. This installation should take around 2 hours. We grade this install a 4 out of 10 on difficulty (10 being very difficult). Note: This product CAN NOT ship to California due to CARB regulations or any other states that has emission standards.

Watch the MBRP Downpipe Duramax LML Install Below:


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