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
FAQ
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.
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.
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.
Will these fit the Silverado SS AWD?
Yes. These headers are compatible with the 2002–2006 Chevrolet Silverado SS AWD 6.0L application.
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.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction and CNC-machined flanges.
Are gaskets included?
Yes. Standard graphite manifold gaskets are included with the headers.
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).