Product Description
MBRP GMCA427 3" Turbo Down Pipe – CARB EO D-763-2
Unlock smoother exhaust flow and lower EGTs on your LML Duramax with MBRP’s Armor Lite 3-inch turbo down pipe. This CARB-compliant design retains factory mounting points for a clean, bolt-on install while improving response and sound on your 2011–2015 Silverado/Sierra HD.
Fitment
- 2011–2015 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax (LML)
- 2011–2015 GMC Sierra 2500HD/3500HD 6.6L Duramax (LML)
- Note: Will not work with a 3-bolt flange style connection.
Cross-Reference / Alternatives (MBRP Only)
- MBRP S6032AL – 4" Filter-Back Single Side (Aluminized), 2011–2019 LML/L5P
- MBRP S6032BLK – 4" Filter-Back Single Side (Black Coated), 2011–2019
- MBRP S6033AL – 4" Dual-Outlet Filter-Back (Aluminized), 2011–2015 LML
- MBRP S60360AL – 5" Filter-Back Single Side (Aluminized), 2011–2019
Why CPP Diesel
Fast shipping, price match, and diesel experts ready to help you dial in your Duramax exhaust setup.
FAQ
Is the GMCA427 legal for use in California?Yes. It carries CARB EO # D-763-2 for 2011–2015 LML applications. Always verify local emissions requirements.
Will this fit my 2015 truck with a 3-bolt flange?
No. This down pipe will not work with a 3-bolt flange style connection.
Do I need custom tuning?
No tuning is required for installation. This is a direct-fit, CARB-compliant component.
What systems pair well with this down pipe?
Match it with an MBRP filter-back like S6032AL (4") or S60360AL (5") for improved flow and sound.
What material is used?
Armor Lite black-coated aluminized steel for durability and value.
