The factory exhaust manifolds on your SS Sedan are one of the first restrictions holding back your LS3. This complete full kit pairs Speed Engineering's 1-7/8" longtube headers with a 3" off-road X-pipe that connects directly to the existing axle-back location — replacing the restrictive factory exhaust manifolds and mid-pipes with a free-flowing stainless system designed for significant horsepower gains, an aggressive exhaust tone, and long-lasting durability. Dyno proven to deliver over 25 rear-wheel horsepower over stock.
Built from 304 natural stainless steel with mandrel-bent primary tubes, CNC-machined flanges, and full TIG-welded construction.
⚠️ Important Installation Notes:
- Rear downstream O₂ sensors are not used — a check engine light for catalyst efficiency will appear and must be disabled via PCM tuning
- Note for Caprice PPV applications: The X-pipe and true dual exhaust setup will require modifications at the axle-back flange for installation on Caprice applications
Kit Includes:
- 1 Pair of 1-7/8" Stainless Longtube Headers
- 1 Three-inch Off-Road X-Pipe / Connection Pipe
- 1 Set of Zinc-Coated Header Bolts (upgrade to stainless ARP bolts available at checkout)
- 2 MLS Exhaust Gaskets
- 2 O₂ Sensor Extension Harnesses
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" Port-Matched Primary Tubes — Full-diameter flow from cylinder head to collector for maximum exhaust scavenging
- 3" Collector with Merge Spikes — Optimized merge geometry 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 6.2L LS3 applications
- Compatible with 6.2L LS3 Engines
Vehicle Applications:
Chevrolet SS Sedan — 6.2L LS3
- 2014 Chevrolet SS Sedan — 6.2L LS3
- 2015 Chevrolet SS Sedan — 6.2L LS3
- 2016 Chevrolet SS Sedan — 6.2L LS3
- 2017 Chevrolet SS Sedan — 6.2L LS3
Frequently Asked Questions:
Q: What is the difference between this kit and the 2" SS Sedan header kit? The primary tube diameter is the key difference. The 1-7/8" headers work well across a broad RPM range and are a strong choice for most street and performance SS Sedan builds. The 2" headers offer a step up in flow better suited for more aggressive builds with supporting modifications.
Q: 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.
Q: What is included in this kit? The kit includes a pair of 1-7/8" stainless longtube headers, a 3" off-road X-pipe, two MLS exhaust gaskets, two O₂ sensor extension harnesses, 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.
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 6.2L LS3 SS Sedan applications compared to stock exhaust manifolds.
Q: What engines are these headers compatible with? These headers are compatible with the 6.2L LS3 engine found in 2014–2017 Chevrolet SS Sedan models.
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 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).
