The factory exhaust manifolds on your GMT900 Silverado, Sierra, or full-size SUV are one of the first restrictions holding back your LS engine. Speed Engineering's 1-3/4" longtube headers are a direct-fit, dyno-proven upgrade delivering over 25 rear-wheel horsepower over stock with improved throttle response and a deeper, more aggressive exhaust tone. Covers 2007–2013 trucks and SUVs on the new GMT900 body style. Y-pipe sold separately and required for installation.
Built from 304 natural stainless steel with mandrel-bent primary tubes, merge spikes, CNC-machined flanges, and full TIG-welded construction. Standard graphite manifold gaskets included.
⚠️ Important Notes:
- 2007 Classic body style only: These headers will NOT fit the 2007 Classic (carry-over GMT800 body). 2007 Classic owners should purchase 1999–2006 exhaust products instead
- Y-pipe: The Speed Engineering Y-pipe works with 6-speed automatic transmissions. Depending on factory exhaust configuration, some cutting or welding may be required for Y-pipe installation
Features:
- Full 1-3/4" Primary Tubes with Merge Spikes — Full-diameter flow from cylinder head to collector for maximum exhaust scavenging
- 3" Collector — Optimized for strong low-to-mid RPM torque
- Mandrel Bent Tubing — Consistent tube diameter through every bend; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the head and collector for a leak-free seal
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Longtube Header Design — Maximum scavenging efficiency vs. shorty or mid-length headers
- Standard Graphite Manifold Gaskets Included
- Dyno Proven — 25+ RWHP gain on 4.8L, 5.3L, 6.0L, and 6.2L applications
- Compatible with 4.8L, 5.3L, 6.0L, and 6.2L LS V8 Engines
- V8 Engines Only
Vehicle Applications:
Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2007 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L ⚠️ New body style only — NOT Classic
- 2008 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2009 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2010 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2011 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2012 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2013 Chevrolet Silverado 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2007 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L ⚠️ New body style only — NOT Classic
- 2008 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2009 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2010 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2011 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2012 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
- 2013 GMC Sierra 1500 (2WD/4WD) — 4.8L/5.3L/6.0L/6.2L
Chevrolet Tahoe (2WD/4WD)
- 2007 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2008 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2009 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2010 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2011 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2012 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2013 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
- 2014 Chevrolet Tahoe (2WD/4WD) — 4.8L/5.3L/6.0L
GMC Yukon (2WD/4WD)
- 2007 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2008 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2009 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2010 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2011 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2012 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2013 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
- 2014 GMC Yukon (2WD/4WD) — 4.8L/5.3L/6.0L
Cadillac Escalade (2WD/4WD)
- 2007 Cadillac Escalade (2WD/4WD) — 6.2L
- 2008 Cadillac Escalade (2WD/4WD) — 6.2L
- 2009 Cadillac Escalade (2WD/4WD) — 6.2L
- 2010 Cadillac Escalade (2WD/4WD) — 6.2L
- 2011 Cadillac Escalade (2WD/4WD) — 6.2L
- 2012 Cadillac Escalade (2WD/4WD) — 6.2L
- 2013 Cadillac Escalade (2WD/4WD) — 6.2L
- 2014 Cadillac Escalade (2WD/4WD) — 6.2L
Cadillac Escalade EXT (2WD/4WD)
- 2007 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2008 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2009 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2010 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2011 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2012 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2013 Cadillac Escalade EXT (2WD/4WD) — 6.2L
- 2014 Cadillac Escalade EXT (2WD/4WD) — 6.2L
Chevrolet Avalanche (2WD/4WD)
- 2007 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2008 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2009 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2010 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2011 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2012 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2013 Chevrolet Avalanche (2WD/4WD) — 5.3L
- 2014 Chevrolet Avalanche (2WD/4WD) — 5.3L
Frequently Asked Questions:
Q: Will these fit the 2007 Classic Silverado or Sierra? No. The 2007 Classic is a carry-over of the older GMT800 body style. These headers are designed for the 2007 new body style (GMT900) only. 2007 Classic owners should purchase 1999–2006 exhaust products.
Q: Is a Y-pipe included? No. These are headers only. The Speed Engineering Y-pipe kit is sold separately and is required for proper installation. The Y-pipe is compatible with 6-speed automatic transmissions. Depending on your factory exhaust configuration, some cutting or welding may be required for Y-pipe installation.
Q: How much horsepower do these headers add? Speed Engineering's 1-3/4" longtube headers are dyno proven to add over 25 rear-wheel horsepower on 2007–2013 GMT900 applications compared to stock exhaust manifolds.
Q: What engines are these headers compatible with? These headers are compatible with GM LS V8 engines including 4.8L, 5.3L, 6.0L, and 6.2L found in 2007–2013 Silverado, Sierra, and GMT900 full-size SUV applications.
Q: What material are these headers made from? 304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and merge spikes.
Q: Are gaskets included? Yes. Standard graphite manifold gaskets are included.
Q: Are these headers street legal? No. These are race-only headers intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).
⚠️ Race Use Only: This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).