Product Description
MBRP GMAL401 is a 4-inch aluminized steel (Armor Lite) front pipe with flange engineered for the 2001–2004 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD with the 6.6L Duramax (LB7). It restores smooth exhaust flow, helps lower EGTs, and pairs perfectly with MBRP downpipe-back and cat-back systems.
Fitment
- 2001–2004 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax (LB7)
- 2001–2004 GMC Sierra 2500HD/3500HD 6.6L Duramax (LB7)
- Pipe Size: 4" OD — Front pipe with flange
- Material/Series: Armor Lite (Aluminized Steel)
Cross-Reference / Alternatives (MBRP-only)
- T409 Stainless (Armor Plus) Equivalent: MBRP GMS9401 4" Front Pipe w/ Flange (Armor Plus)
- Pair With These MBRP Systems for 01–04 Duramax:
UPC / Identifiers
- GMAL401 (Armor Lite): UPC 882963100634
- GMS9401 (Armor Plus, cross-reference): UPC 882963100658
Why Buy From CPP Diesel
Fast shipping, price-match mindset, and curated MBRP coverage for Duramax platforms. We stock the parts we recommend and back them with real-world tech guidance.
FAQ
Is GMAL401 stainless steel?No. GMAL401 is Armor Lite (aluminized steel). If you want stainless (T409), choose the cross-reference GMS9401.
Which model years does this fit?
It’s specified for 2001–2004 Silverado/Sierra 2500HD/3500HD 6.6L Duramax (LB7). Some retailers list through 2005, but we follow the 2001–2004 coverage from MBRP’s official listing.
Will this bolt up to my MBRP downpipe-back kit?
Yes—this front pipe is designed to work with MBRP’s 4" downpipe-back systems for 2001–2004 Duramax. See recommended pairings above.
Do I need tuning with this pipe?
No tuning is required for installation of the front pipe alone. Always observe local emissions laws.
