The factory exhaust manifolds on your T1XX 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. Both the Speed Engineering Y-pipe and X-pipe kits are compatible with this platform's 8 and 10 speed automatic transmissions and are sold separately. O₂ sensor extensions are 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:
- O₂ sensor extensions are required for proper installation
- Y-pipe and X-pipe kits both work with 8 and 10 speed automatic transmissions — sold separately
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
- 2019 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2020 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2021 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2022 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2023 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2024 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2019 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2020 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2021 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2022 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2023 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2024 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
Chevrolet Tahoe SUV (2WD/4WD)
- 2021 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2022 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2023 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
- 2024 Chevrolet Tahoe (2WD/4WD) — 5.3L/6.2L
GMC Yukon SUV (2WD/4WD)
- 2021 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2022 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2023 GMC Yukon (2WD/4WD) — 5.3L/6.2L
- 2024 GMC Yukon (2WD/4WD) — 5.3L/6.2L
Cadillac Escalade SUV (2WD/4WD)
- 2021 Cadillac Escalade (2WD/4WD) — 6.2L
- 2022 Cadillac Escalade (2WD/4WD) — 6.2L
- 2023 Cadillac Escalade (2WD/4WD) — 6.2L
- 2024 Cadillac Escalade (2WD/4WD) — 6.2L
Frequently Asked Questions:
Q: Do I need O₂ sensor extensions for these headers?
Yes. O₂ sensor extensions are required for proper installation of these headers.
Q: Is a Y-pipe or X-pipe included with these headers?
No. These are headers only. Both the Speed Engineering Y-pipe and X-pipe kits are sold separately and are compatible with 8 and 10 speed automatic transmissions on this platform.
Q: What is the difference between the Y-pipe and X-pipe options for this platform?
The Y-pipe merges both exhaust banks into a single outlet for connection to a single cat-back system. The X-pipe connects the two header collectors with a crossover for improved exhaust pulse balancing and tone, without connecting to a cat-back on its own. Choose based on your desired exhaust configuration.
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 T1XX 5.3L and 6.2L 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).