Product Description
MBRP GP012 is the 4" front exhaust pipe for 2001–2004 Chevy/GMC 2500HD/3500HD 6.6L Duramax (LB7). It’s a straight-through front section that helps reduce backpressure 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)
Cross-Reference / Alternatives (MBRP-only)
- GMAL401 – 4" Front Pipe with Flange (Aluminized)
- GMS9401 – 4" Front Pipe with Flange (T409 Stainless)
- S6005P – 4" Downpipe-Back, Single Side Exit (Aluminized)
- S6005PLM – 4" Downpipe-Back, No Muffler (Aluminized)
- GMAL413 – 4" Regular Cab Adaptor (01–05)
Why Buy from CPP Diesel
- Diesel-savvy support and fast shipping
- Price-match mindset and curated MBRP selection
Specifications
| Brand | MBRP |
|---|---|
| Part # | GP012 |
| UPC | 882963103871 |
| Diameter | 4 inch |
| Construction | Mandrel-bent steel front pipe |
| Finish | Raw |
| Vehicle Configuration | 2001–2004 GM 2500HD/3500HD 6.6L Duramax (LB7) |
| Position | Front / intermediate pipe |
| Warranty | Per MBRP series |
FAQ
Will GP012 fit my 2004 Duramax?
Yes—GP012 fits 2001–2004 Silverado/Sierra 2500HD/3500HD with the 6.6L Duramax (LB7). If your 2004 is a changeover truck, confirm it’s LB7.
Do I need the flange version?
If your setup requires a flanged connection, see GMAL401 (aluminized) or GMS9401 (T409 stainless).
What systems does this pair with?
It’s commonly paired with MBRP 01–04 downpipe-back kits like S6005P or the no-muffler S6005PLM.
Is this CARB approved?
This component is generally intended for federal-emissions trucks. Always follow local laws and verify compliance before installation.
