The factory exhaust manifolds on your Trailblazer SS are one of the first restrictions holding back your LS2. This complete bolt-on system replaces the restrictive factory exhaust manifolds and mid-pipes with free-flowing 304 stainless longtube headers and a 3" off-road Y-pipe that connects directly to the existing cat-back location — delivering significant horsepower gains, improved throttle response, and a deep, aggressive exhaust tone. Dyno proven to deliver over 25 rear-wheel horsepower over stock.
Built from 304 natural stainless steel with mandrel-bent primary tubes, a merge spike, CNC-machined flanges, and full TIG-welded construction. Known for their unbeatable combination of quality, performance, and affordability, these headers are one of the best-fitting, most cost-effective options on the market for your TBSS.
⚠️ Important Note: Rear downstream O₂ sensors are not used. A check engine light for catalyst efficiency will appear and must be disabled via PCM tuning.
Kit Includes:
- 1 Pair of Stainless Steel 1-7/8" Longtube Headers
- 1 Three-inch Off-Road Y-Pipe / Connection Pipe
- 1 Set of Zinc-Coated Header Bolts (upgrade to stainless ARP bolts available at checkout)
- 2 MLS Exhaust Gaskets
Optional: Speed Engineering LS Spark Plug Wires and Plug Wire Fire Sleeves can be added at the time of purchase.
Features:
- Full 1-7/8" Primary Tubes — Maximum flow from cylinder head to collector for aggressive LS2 performance
- 3" Collector — Optimized for strong low-to-mid RPM torque
- Merge Spike — Improved exhaust scavenging
- Mandrel Bent Tubing — Consistent tube diameter through every bend; no crimping, no restriction
- CNC Machined Flanges — Precision fit at the cylinder head 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 LS2 applications
- Compatible with 6.0L LS2 Engines
Vehicle Applications:
Chevrolet Trailblazer SS — LS2 6.0L
- 2006 Chevrolet Trailblazer SS — 6.0L LS2
- 2007 Chevrolet Trailblazer SS — 6.0L LS2
- 2008 Chevrolet Trailblazer SS — 6.0L LS2
- 2009 Chevrolet Trailblazer SS — 6.0L LS2
FAQ
What is the difference between this kit and the headers-only listing (25-1041)?
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.
Will I get a check engine light after installing this kit?
Yes. The rear downstream O₂ sensors are not used with this system, which will trigger a catalyst efficiency code. This must be resolved through PCM tuning and cannot be cleared by simply resetting the ECU.
Does this fit both AWD and RWD Trailblazer SS models?
The headers themselves are designed for the LS2-equipped TBSS platform. Speed Engineering can confirm fitment for a specific drivetrain configuration if needed.
What is included in this kit?
The kit includes a pair of 1-7/8" stainless longtube headers, a 3" off-road Y-pipe, two MLS exhaust gaskets, and zinc-coated header bolts. An upgrade to stainless ARP bolts is available at checkout. Speed Engineering LS spark plug wires and plug wire fire sleeves can also be added at the time of purchase.
How much horsepower does this kit add?
Speed Engineering's 1-7/8" longtube headers are dyno proven to add over 25 rear-wheel horsepower on Trailblazer SS LS2 applications compared to stock exhaust manifolds.
What material are these headers made from?
304 natural stainless steel with full TIG-welded construction, CNC-machined flanges, and a merge spike.
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).
