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
FAQ
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.
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.
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.
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.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and merge spikes.
Are gaskets included?
Yes. Standard graphite manifold gaskets are included.
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).
