Product Description
MBRP GMS9423 is a 4-inch T409 stainless steel regular-cab adaptor/front pipe section engineered to complete your 6.6L Duramax exhaust routing on specific classic-body trucks. Built for durability and proper fit on regular cab, long box configurations, it’s a straightforward bolt-on piece that integrates cleanly with MBRP systems and OE-style connections.
Fitment
- 2006–2007 Chevrolet Silverado 2500HD/3500HD, 6.6L Duramax (Regular Cab, Long Box only)
- 2006–2007 GMC Sierra 2500HD/3500HD, 6.6L Duramax (Regular Cab, Long Box only)
- Engine family: LLY/LBZ (classic body). Excludes 2007.5+ LMM “new body” trucks.
Note on years: Although often categorized with 2001–2007 Duramax components, this adaptor specifically fits 2006–2007 regular-cab/long-box applications.
Specs
- Tubing size: 4-inch
- Material: T409 Stainless Steel
- Series: Armor Plus
- Configuration: Regular Cab / Long Box only
Cross-Reference / Alternatives (MBRP only)
- Front Pipe (01–04): MBRP GP012 4" FRONT PIPE
- Tail Pipe (01–07 classic): MBRP GP010 TAIL PIPE
- Front Pipe w/ Flange (01–04): MBRP GMS9401 4" FRONT PIPE W/ FLANGE
- Turbo Downpipe (01–04 LB7): MBRP GMCA425 3" TURBO DOWN PIPE (CARB)
- Universal Adapter (3.5" ID → 4" OD): MBRP UA2007 UNIVERSAL ADAPTER
FAQ
Will this fit extended cab or crew cab trucks?
No. This adaptor is designed for Regular Cab, Long Box 2500HD/3500HD trucks in model years 2006–2007 (classic body).
Is the GMS9423 made from stainless steel?
Yes, it is constructed from T409 stainless steel for strong corrosion resistance and long service life.
Does this fit 2007.5+ LMM trucks?
No. It excludes the 2007.5–2010 LMM “new body” models.
Do I need custom tuning to install this pipe?
No tuning is required for installing this adaptor section; it’s a bolt-on fit when used in the intended applications.
What warranty does MBRP provide?
MBRP backs Armor Plus (T409) components with a lifetime warranty against defects in materials and workmanship.
