Product Description
MBRP GP012 4 INCH FRONT EXHAUST PIPE FOR 2001-2004 CHEVROLET SILVERADO AND GMC SIERRA 2500HD/3500HD 6.6L DURAMAX LB7
The MBRP GP012 front exhaust pipe is designed for 2001-2004 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax LB7 diesel engine.
This 4-inch mandrel-bent front exhaust pipe improves exhaust flow and helps reduce backpressure compared to restrictive factory piping.
Designed to pair with MBRP downpipe-back and cat-back exhaust systems, the GP012 provides improved exhaust efficiency, smoother flow characteristics, and reliable fitment for Duramax performance and towing applications.
FEATURES
- 4-inch mandrel-bent front exhaust pipe
- Designed for 2001-2004 Duramax LB7 applications
- Helps reduce exhaust backpressure
- Improves exhaust flow efficiency
- Compatible with MBRP exhaust systems
- Direct-fit installation design
- Ideal for towing and performance applications
FITMENT
- 2001 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2001 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2002 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2002 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2003 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2003 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2004 Chevrolet Silverado 2500HD 6.6L Duramax LB7
- 2004 Chevrolet Silverado 3500 6.6L Duramax LB7
- 2001 GMC Sierra 2500HD 6.6L Duramax LB7
- 2001 GMC Sierra 3500 6.6L Duramax LB7
- 2002 GMC Sierra 2500HD 6.6L Duramax LB7
- 2002 GMC Sierra 3500 6.6L Duramax LB7
- 2003 GMC Sierra 2500HD 6.6L Duramax LB7
- 2003 GMC Sierra 3500 6.6L Duramax LB7
- 2004 GMC Sierra 2500HD 6.6L Duramax LB7
- 2004 GMC Sierra 3500 6.6L Duramax LB7
Fitment Note: Verify engine code before ordering. Some 2004 trucks may have LLY engine changeover configurations.
WHAT'S INCLUDED
- 1 MBRP GP012 4-inch front exhaust pipe
CROSS-REFERENCE / RELATED MBRP PARTS
- MBRP GMAL401 4-inch front pipe with flange
- MBRP GMS9401 4-inch stainless front pipe with flange
- MBRP S6005P 4-inch downpipe-back exhaust system
- MBRP S6005PLM 4-inch no muffler downpipe-back system
- MBRP GMAL413 regular cab exhaust adapter
BENEFITS
- Improves exhaust flow over restrictive factory piping
- Supports towing and performance applications
- Pairs with aftermarket exhaust systems
- Helps improve turbocharger efficiency
- Mandrel bends maintain consistent pipe diameter
SPECIFICATIONS
- Brand: MBRP
- Part Number: GP012
- Product Type: Front exhaust pipe
- Pipe Diameter: 4 inch
- Material: Steel
- Construction: Mandrel-bent tubing
- Finish: Raw steel
- Engine Compatibility: 6.6L Duramax LB7
- Vehicle Compatibility: 2001-2004 Silverado/Sierra 2500HD and 3500HD
- Position: Front exhaust pipe
- UPC: 882963103871
- Warranty: Manufacturer warranty applies
- Condition: New
INSTALLATION NOTES
- Inspect exhaust hangers and clamps before installation
- Verify compatibility with existing exhaust components
- Professional installation recommended for best fitment
- Retorque exhaust clamps after initial heat cycles
- Check for exhaust leaks after installation
FAQ
Will this fit my 2004 Duramax?
Yes. This front exhaust pipe fits 2001-2004 Silverado and Sierra HD trucks equipped with the 6.6L Duramax LB7 engine.
Does this pipe include a flange?
No. If you require a flanged connection, consider MBRP GMAL401 or GMS9401.
What exhaust systems does this pair with?
This front pipe commonly pairs with MBRP downpipe-back exhaust systems for 2001-2004 LB7 Duramax applications.
What are the benefits of a 4-inch exhaust pipe?
A larger mandrel-bent exhaust pipe improves exhaust flow, reduces restriction, and supports improved turbo efficiency.
Is this emissions compliant?
Always verify local and state emissions regulations before installation.
