Looking to upgrade the exhaust on your 6.0L GMT800 without removing the EGR system? Speed Engineering's 1-5/8" shorty headers include an EGR fitting for a direct, emissions-compatible upgrade on 6.0L applications. Built from 304 natural stainless steel with mandrel-bent tubing, CNC-machined flanges, and full TIG-welded construction. Dyno proven to deliver over 12 rear-wheel horsepower over stock manifolds.
Compatible with the factory dual 2-into-1 muffler exhaust system — no fabrication required.
Features:
- 1-5/8" Primary Tubes — Sized for improved flow on 6.0L applications
- 2.5" Collector — Optimized for strong low-to-mid RPM torque
- EGR Fitting Included — Maintains factory EGR system compatibility
- Works with Factory Dual (2-into-1) Exhaust System — No fabrication required
- Mandrel Bent Tubing — Consistent tube diameter throughout; 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
- Standard Graphite Manifold Gaskets Included
- Dyno Proven — 12+ RWHP gain on 6.0L applications
- Compatible with 6.0L LS V8 Engines
- V8 Engines Only
Vehicle Applications:
Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 1999 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2000 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2001 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2002 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2003 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2004 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2005 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
- 2006 Chevrolet Silverado 1500 (2WD/4WD) — 6.0L
Chevrolet Silverado SS (AWD) — 6.0L
- 2002 Chevrolet Silverado SS (AWD) — 6.0L
- 2003 Chevrolet Silverado SS (AWD) — 6.0L
- 2004 Chevrolet Silverado SS (AWD) — 6.0L
- 2005 Chevrolet Silverado SS (AWD) — 6.0L
- 2006 Chevrolet Silverado SS (AWD) — 6.0L
GMC Sierra 1500 (2WD/4WD) — 6.0L
- 1999 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2000 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2001 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2002 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2003 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2004 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2005 GMC Sierra 1500 (2WD/4WD) — 6.0L
- 2006 GMC Sierra 1500 (2WD/4WD) — 6.0L
Chevrolet Tahoe (2WD/4WD) — 6.0L
- 1999 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2000 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2001 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2002 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2003 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2004 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2005 Chevrolet Tahoe (2WD/4WD) — 6.0L
- 2006 Chevrolet Tahoe (2WD/4WD) — 6.0L
GMC Yukon (2WD/4WD) — 6.0L
- 1999 GMC Yukon (2WD/4WD) — 6.0L
- 2000 GMC Yukon (2WD/4WD) — 6.0L
- 2001 GMC Yukon (2WD/4WD) — 6.0L
- 2002 GMC Yukon (2WD/4WD) — 6.0L
- 2003 GMC Yukon (2WD/4WD) — 6.0L
- 2004 GMC Yukon (2WD/4WD) — 6.0L
- 2005 GMC Yukon (2WD/4WD) — 6.0L
- 2006 GMC Yukon (2WD/4WD) — 6.0L
Cadillac Escalade (2WD/4WD) — 6.0L
- 1999 Cadillac Escalade (2WD/4WD) — 6.0L
- 2000 Cadillac Escalade (2WD/4WD) — 6.0L
- 2001 Cadillac Escalade (2WD/4WD) — 6.0L
- 2002 Cadillac Escalade (2WD/4WD) — 6.0L
- 2003 Cadillac Escalade (2WD/4WD) — 6.0L
- 2004 Cadillac Escalade (2WD/4WD) — 6.0L
- 2005 Cadillac Escalade (2WD/4WD) — 6.0L
- 2006 Cadillac Escalade (2WD/4WD) — 6.0L
Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2001 Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2002 Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2003 Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2004 Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2005 Chevrolet Avalanche (2WD/4WD) — 6.0L
- 2006 Chevrolet Avalanche (2WD/4WD) — 6.0L
Frequently Asked Questions:
Q: Do these headers retain the factory EGR system? Yes. These headers include an EGR fitting for direct compatibility with the factory EGR system on 6.0L applications.
Q: Will these headers work with my factory dual exhaust system? Yes. These headers are compatible with the factory dual 2-into-1 muffler exhaust system with no fabrication required.
Q: How much horsepower do these headers add? Speed Engineering's 1-5/8" shorty headers are dyno proven to add over 12 rear-wheel horsepower on 6.0L applications compared to stock exhaust manifolds.
Q: Will these fit the Silverado SS AWD? Yes. These headers are compatible with the 2002–2006 Chevrolet Silverado SS AWD 6.0L application.
Q: What engines are these headers compatible with? These headers are compatible with the 6.0L LS V8 engine found in 1999–2006 Silverado, Sierra, Tahoe, Yukon, Escalade, and Avalanche applications.
Q: What material are these headers made from? 304 natural stainless steel with full TIG-welded construction and CNC-machined flanges.
Q: Are gaskets included? Yes. Standard graphite manifold gaskets are included with the headers.
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).