The factory exhaust manifolds on your K2XX Silverado, Sierra, or full-size SUV are one of the first restrictions holding back your LS engine. Speed Engineering's 1-7/8" 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. 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:
- Y-pipe is compatible with 6 speed and 8 speed automatic transmissions — sold separately
- GM 2500/3500 6.0L applications: Use the 2007–2013 GMT900 exhaust products instead
Features:
- Full 1-7/8" 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 5.3L and 6.2L applications
- Compatible with 5.3L and 6.2L V8 Engines
- V8 Engines Only
Vehicle Applications:
Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2014 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2015 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2016 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2017 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2018 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2014 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2015 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2016 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2017 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2018 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
Chevrolet Tahoe (2WD/4WD)
- 2015 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2016 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2017 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2018 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2019 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
GMC Yukon (2WD/4WD)
- 2015 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2016 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2017 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2018 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2019 GMC Yukon (2WD/4WD) — 5.3L/6.2L
Cadillac Escalade (2WD/4WD)
- 2015 Cadillac Escalade (2WD/4WD) — 6.2L
- 2016 Cadillac Escalade (2WD/4WD) — 6.2L
- 2017 Cadillac Escalade (2WD/4WD) — 6.2L
- 2018 Cadillac Escalade (2WD/4WD) — 6.2L
- 2019 Cadillac Escalade (2WD/4WD) — 6.2L
Frequently Asked Questions:
Q: Is a Y-pipe included with these headers? No. These are headers only. The Speed Engineering Y-pipe is sold separately and is required for proper installation. The Y-pipe is compatible with 6 speed and 8 speed automatic transmissions.
Q: Will these fit a 2500 or 3500 with a 6.0L engine? No. GM 2500/3500 6.0L applications require the 2007–2013 GMT900 exhaust products.
Q: What is the difference between these headers and the 2014–2018 full kit (25-1037)? The full kit includes these headers plus the Speed Engineering Y-pipe, header bolts, and MLS exhaust gaskets. Choose the full kit for an all-in-one purchase; choose headers only if you already have or plan to source the Y-pipe separately.
Q: How much horsepower do these headers add? Speed Engineering's 1-7/8" longtube headers are dyno proven to add over 25 rear-wheel horsepower on 5.3L and 6.2L K2XX applications compared to stock exhaust manifolds.
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).