Speed Engineering 25-1012 LS1 Truck Longtube Headers
LS1 Truck Header Primaries
LS1 Truck Header Flange
Merge Collector Spike
Speed Engineering Off-Road Y-Pipe 1999-06 Truck & SUV
Speed Engineering Spark Plug Wires
Speed Engineering Truck & SUV 1 3/4" Longtube Headers (1999-2006)

Speed Engineering Truck & SUV 1 3/4" Longtube Headers (1999-2006)

SKU: 25-1012

Regular price $289.99 Save $-289.99
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Only -2714 items in stock!

(In Stock)

Speed Engineering headers are made out of 304 stainless steel and offer great quality, performance, and affordability. Our headers are mandrel bent, tig welded, and feature polished stainless steel construction. All of our headers have been dyno proven. We stand behind our headers in saying you will not find a better fitting, quality built, budget header for your vehicle.

Features include:

  • Mandrel Bent Tubing
  • Merge Spikes
  • Race Version with "NO" Air & EGR Fittings
  • Full 1 3/4" Primaries
  • 3" Collector
  • Gains over 25+ rwhp
  • V8 Engines Only
  • 4.8L, 5.3L, 6.0L Engines
  • CNC Machined Flanges
  • Polished Stainless Steel
  • Standard Graphite Manifold Gaskets

Vehicle Applications:

  • 1999-2006 Chevrolet Truck & SUV (2wd & 4wd)
  • 1999-2006 GMC Truck & SUV (2wd & 4wd)
  • 2002-2006 Cadillac Truck & SUV (2wd & 4wd)
  • 2002-2006 Chevrolet Avalanche (2wd & 4wd)

Revised Y-Pipe: Now works with 4L60E & 4L80E transmissions with factory pan. Also allows more room for 4wd vehicles.

Note: If using a larger 4L80E transmission the bellhousing ears may need to be trimmed for proper clearance.

Note: Earlier 2500's might have fitment issues due to chassis being designed from previous years.

(Warning) This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability.


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