Product Description
MBRP GMS9401 is a T409 stainless 4" front exhaust pipe with flange from the Armor Plus (XP) Series, built to improve flow and durability on early Duramax trucks.
Key Features
- T409 stainless steel, 4" diameter
- Flanged connection for straightforward install
- Lifetime warranty (Armor Plus/XP Series)
- Not for vehicles equipped with a catalytic converter
- Not for sale in California
Fitment
- 2001–2004 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax (LB7), no catalytic converter
- 2001–2004 GMC Sierra 2500HD/3500HD 6.6L Duramax (LB7), no catalytic converter
UPC: 882963100658
Cross-Reference / Alternatives (MBRP-only)
- Aluminized alternative front pipe: MBRP GP012 4" Front Exhaust Pipe (Aluminized)
- Armor Lite front pipe (related): MBRP GMAL401 4" Front Pipe Flange
- Regular cab adapter (’06–’07): MBRP GMS9423 4" Exhaust Pipe (Reg. Cab Adapter)
- 3" Turbo Downpipe (Armor BLK): MBRP GM8425
- 3" Turbo Downpipe (CARB D-763-2): MBRP GMCA425
- 04–up system options, same platform (Downpipe-Back):
FAQ — Is this pipe street-legal?
This front pipe is not for vehicles equipped with a catalytic converter and is not to be sold in California. Check local and state emissions regulations before purchase/installation.
FAQ — What material is used?
T409 stainless steel for excellent corrosion resistance versus aluminized alternatives.
FAQ — Will it fit my LB7 Duramax?
Yes, it’s designed for 2001–2004 Silverado/Sierra 2500HD/3500HD 6.6L Duramax (LB7) without a catalytic converter.
FAQ — What size is the tubing?
4-inch diameter front pipe with flange.
FAQ — Warranty coverage?
Armor Plus (XP) Series carries a Lifetime Warranty from MBRP.
