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USD 149.99
Part #: MBGM8424

MBRP GM8424 Turbo Outlet 3" Performance Duramax Down Pipe

2004.5-2010 GM 6.6L Duramax LLY/LBZ/LMM
Part #: MBGM8424
★★★★★ ★★★★★ 12 Reviews
Temporarily Out of stock - More on the way!

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XDP has teamed up with MBRP to help produce the missing link in the Duramax Exhaust System. Now Duramax LLY/LBZ/LMM owners have the ability of connecting the turbo and aftermarket down-pipe back exhaust system by removing the restrictive stock pipe pictured below. The MBRP down pipe provides a smoother flow from the turbo resulting in lower EGTs and increased performance. The down pipe is a relatively easy install due to the precision bends that youve come to expect from MBRP.


  • 3" Mandrel Bent
  • Extra Thick Aluminized Steel
  • Satin Black Ceramic Coating 
  • High-Heat Thermal Wrap
  • Steel CNC Machined Flanges


  • Smoother Flow from Turbo
  • Reduced EGTs
  • Increased Performance
  • Throatier Sound
  • Faster Turbo Spool-up


  • MFG. Number GM8424
  • Manufacturer Name MBRP Inc.
  • Shipping Weight 7.00 lb.
  • Shipping Length 23 in.
  • Shipping Width 8 in.
  • Shipping Height 14 in.
  • Fuel Type Diesel
  • UPC 882963110589
  • Prop 65 WARNING: Cancer & Reproductive Harm -


★★★★★ ★★★★★
4.8/5 Stars out of 12 Reviews
Down pipe
(Oregon) | April 26th, 2020
Sounds good and nicely built
Great air flow!!
(Albany GA) | March 4th, 2019
Invoice number 1506699Bought this for my 07 LBZ. Very easy to install and well worth the money. Greatly improved the sound of my turbo and I've noticed better response. Product shipped from NV and I received it very quick. Definitely recommend and would buy again.
Well worth the work
(Virginia) | November 14th, 2018
So much better airflow. Makes the stock down pipe look like a straw. Installation went smooth. Replaced this when i upgraded my up pipes and added a 4" exhaust. Sounds awesome. Throttle response improved immediately. This is one upgrade that gets overlooked but is a necessity.
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Questions and Answers

Ask XDP a Question about this product (Allow 24-48 hours for reply)

Most Popular Questions

Does this downpipe include the heat wrap?
View Staff Answer 

High-heat thermal wrap is featured with the pipe out of the box.

I ordered the 5" MBRP exhaust system will this go with that or is there a 5" one i have to order also?
View Staff Answer 

The MBRP Turbo Outlet 3" Performance Duramax down pipe will work with all stock and aftermarket exhaust system regardless of the size.

Do you reuse the stock turbo heat shield?
View Staff Answer 

See the MBRP Install Instructions below:

Will this work with 4" MBRP front pipe? Lbz
View Staff Answer 
Yes! An easy rule to follow is that since this replaces your factory downpipe, any exhaust that fits with your factory downpipe will also fit with the MBRP Downpipe.
XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
  • Effective 3/18 we have decided to temporarily close both of our retail stores in NJ and NV.
  • Our technical sales team remains available Mon-Fri 8:30am-9pm and Saturday 10:30am-7pm EST.
  • All employees have been encouraged to follow the CDC's recommendations at home and in the workplace.
The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.
Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.