MBRP GMAL413 4" REGULAR CAB ADAPTOR – ALUMINIZED STEEL – 2001–2005 GM SILVERADO/SIERRA 2500/3500 6.6L DURAMAX (REGULAR CAB LONG BOX)

Product Description

MBRP GMAL413 is a 4" aluminized steel regular cab adaptor pipe built to adapt select MBRP exhaust systems to 2001–2005 GM Silverado/Sierra 2500/3500 6.6L Duramax Regular Cab Long Box trucks. Designed for durability and easy bolt-on installation.

Fitment

• 2001–2005 Chevrolet Silverado 2500HD/3500HD, 6.6L Duramax (LB7/LLY), Regular Cab Long Box
• 2001–2005 GMC Sierra 2500HD/3500HD, 6.6L Duramax (LB7/LLY), Regular Cab Long Box
• Use to adapt compatible MBRP systems (see Cross-References) to Regular Cab LB trucks

Cross-Reference / Alternatives (MBRP only)

• MBRP S6000AL – 4" Cat-Back (2001–2005 GM 6.6L Duramax)
• MBRP S6005P – 4" Downpipe-Back Single Side (2001–2004 GM 6.6L Duramax)
• MBRP GMS9423 – 4" Regular Cab Adapter (2006–2007 GM 6.6L Duramax)

Why Buy from CPP Diesel

• Fast shipping and diesel-savvy support
• Carefully curated MBRP catalog for GM Duramax applications
• Secure checkout & straightforward returns

UPC

882963122735

Specifications

FAQ

Do I need this adapter if I have a Regular Cab Long Box (RC/LB)?

Yes—GMAL413 adapts compatible MBRP systems to Regular Cab Long Box trucks built from 2001–2005.

Which MBRP systems pair with GMAL413?

Common matches include the S6000AL 4" Cat-Back. See Cross-Reference above for more compatible, model-year-specific options.

Is installation bolt-on?

Yes. It’s designed for a straightforward bolt-on fit with standard hand tools.

Aluminized vs. stainless—what’s the difference?

Aluminized steel delivers value and performance; stainless resists corrosion better in harsh climates. Choose based on your environment and budget.

Will it change sound or power?

The adapter itself doesn’t add power; it enables proper system fitment so your MBRP exhaust can perform as intended.