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Upgrade exhaust flow and turbo response on your 6.6L Duramax-powered HD truck with the MBRP 3-Inch Armor BLK Turbo Downpipe. Designed to replace the restrictive factory downpipe, this upgrade helps reduce exhaust backpressure while supporting improved throttle response and diesel performance. Constructed from black-coated aluminized steel, it offers durability, corrosion resistance, and a clean under-vehicle appearance. This downpipe is a direct-fit solution for select 2011–2015 GM HD applications and is backed by MBRP’s 3-year warranty.
Product Specifications
Brand: MBRP
Part Number: GMCA427
Product Type: Turbo Downpipe
Exhaust Series: Armor BLK
Pipe Diameter: 3"
Material: Black-Coated Aluminized Steel
Engine: 6.6L Duramax V8
Vehicle Type: Diesel
Vehicle Configuration:
6.6L Duramax engine only
3-bolt flange models excluded
Universal: No (Vehicle-Specific Fit)
Warranty: 3-Year Manufacturer Warranty
Chevrolet Silverado 2500HD
2011
2012
2013
2014
2015
Chevrolet Silverado 3500HD
2011
2012
2013
2014
2015
GMC Sierra 2500HD
2011
2012
2013
2014
2015
GMC Sierra 3500HD
2011
2012
2013
2014
2015
Note: Fits 6.6L Duramax diesel models only.
Does not fit vehicles equipped with a 3-bolt flange.
