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SKU: GP134S | UPC: 677418012422
Gibson 2005-2006 Chevrolet Avalanche 2500 LS 8.1L 1-3/4in 16 Gauge Performance Header - Stainless
Gibson Performance Headers GP134S deliver dyno-tuned power gains in horsepower and torque across low and mid-range RPM for highway speeds on 2004-2006 Chevrolet Avalanche 2500 and compatible GM trucks with 8.1L engines. These 1-3/4 inch 16-gauge stainless steel headers replace factory manifolds directly using the stock crossover pipe for improved engine breathing and lower operating temperatures. Perfect for street, off-road, lowered or lifted vehicles with no welding required and full 50-state street legality.
Key Features
- Dyno-Tuned Design: Engineered for maximum usable horsepower and torque at everyday driving RPMs with proven gains on 8.1L Vortec engines
- Premium Stainless Construction: 16-gauge tubing and 3/8-inch heavy-duty laser-cut port flanges prevent warping, leaks, and ensure long-lasting durability
- Bolt-On Installation: Direct replacement for stock manifolds with OEM-style connections, premium gaskets, and hardware included for hassle-free fit
- Emissions Compliant: Meets EPA and CARB standards for 50-state legality without impacting factory warranty
- Versatile Application: Fits lowered, raised, street, and off-road setups while reducing engine heat for better performance
Product Notes
- Retains factory crossover pipe for simple integration and emissions compliance
- MPN GP134S backed by Gibson Lifetime Limited Warranty
- Special order item ships via standard ground freight
Installation Notes
- Professional installation recommended.
- No welding or modifications needed. bolts directly to factory mid-pipes
- Includes all necessary premium gaskets, hardware, and OEM connections
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004 | Chevrolet | Avalanche 2500 | Base |
| 2005-2006 | Chevrolet | Avalanche 2500 | LS |
| 2005-2006 | Chevrolet | Avalanche 2500 | LT |
| 2004-2005 | Chevrolet | Silverado 2500 HD | Base |
| 2004-2005 | Chevrolet | Silverado 2500 HD | LS |
| 2004-2005 | Chevrolet | Silverado 2500 HD | LT |
| 2004-2005 | Chevrolet | Silverado 2500 HD | WT |
| 2004-2005 | Chevrolet | Silverado 3500 | Base |
| 2004-2005 | Chevrolet | Silverado 3500 | LS |
| 2004-2005 | Chevrolet | Silverado 3500 | LT |
| 2004 | Chevrolet | Silverado 3500 | WT |
| 2004-2005 | Chevrolet | Suburban 2500 | LS |
| 2004-2005 | Chevrolet | Suburban 2500 | LT |
| 2004-2005 | GMC | Sierra 2500 HD | Base |
| 2004-2005 | GMC | Sierra 2500 HD | SLE |
| 2004-2005 | GMC | Sierra 2500 HD | SLT |
| 2004-2005 | GMC | Sierra 2500 HD | WT |
| 2004-2005 | GMC | Sierra 3500 | Base |
| 2004-2005 | GMC | Sierra 3500 | SLE |
| 2004-2005 | GMC | Sierra 3500 | SLT |
| 2004-2005 | GMC | Sierra 3500 | WT |
| 2004-2005 | GMC | Yukon XL 2500 | SLE |
| 2004-2005 | GMC | Yukon XL 2500 | SLT |
Why Choose Gibson?
- Over 30 years of exhaust engineering expertise for GM heavy-duty trucks
- Dyno-tested on real vehicles for verified power gains on 8.1L engines
- Made in USA with lifetime warranty on materials and craftsmanship
Frequently Asked Questions
-
Q: Will GP134S fit my 2005 Chevrolet Silverado 2500 HD LS 8.1L?
A: Yes, confirmed fit for 2004-2005 Silverado 2500 HD Base, LS, LT, WT with 8.1L Vortec. check submodel in fitment table -
Q: What material are these headers made from?
A: 16-gauge T-304 stainless steel tubing with 1-3/4 inch primaries and 3/8-inch laser-cut flanges for corrosion resistance and strength -
Q: Does installation void my warranty or require tuning?
A: No impact on factory warranty. bolt-on design uses stock parts, no tune or welding needed, fully emissions legal
Shipping & Handling
- Method: Standard ground freight
- Availability: In stock - ships same or next business day
- Packaging: Oversized box measures 48 x 18 x 12 inches
- Weight: 45 lbs
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