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Gibson 05-06 Chevrolet Avalanche 2500 LS 8.1L 1-3/4in 16 Gauge Performance Header - Stainless Gibson GIBGP134S
Gibson 05-06 Chevrolet Avalanche 2500 LS 8.1L 1-3/4in 16 Gauge Performance Header - Stainless Gibson GIBGP134S
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Gibson 05-06 Chevrolet Avalanche 2500 LS 8.1L 1-3/4in 16 Gauge Performance Header - Stainless

Gibson
GIBGP134S
677418012422
Headers & Manifolds
Out of stock
$ 1,496.70

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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