The factory exhaust manifolds on your Gen 3 CTS-V are one of the first restrictions holding back your LT4. Speed Engineering's 1-7/8" longtube headers are a direct-fit, dyno-proven upgrade — mandrel bent, TIG-welded, and CNC-machined from 304 natural stainless steel for maximum exhaust flow and over 25 rear-wheel horsepower over stock. Speed Engineering X-pipe kit is required for installation and sold separately.
Features:
- Full 1-7/8" Port-Matched Primary Tubes — Maximum flow from cylinder head to collector for aggressive LT4 performance
- 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 CTS-V LT4 applications
- Compatible with 6.2L LT4 Supercharged Engines
Vehicle Applications:
Cadillac CTS-V — LT4 6.2L Supercharged
- 2016 Cadillac CTS-V (RWD) — 6.2L LT4
- 2017 Cadillac CTS-V (RWD) — 6.2L LT4
- 2018 Cadillac CTS-V (RWD) — 6.2L LT4
- 2019 Cadillac CTS-V (RWD) — 6.2L LT4
FAQ
Is an X-pipe included with these headers?
No. These are headers only. The Speed Engineering X-pipe kit is required for proper installation and is sold separately.
What is the difference between these 1-7/8" headers and the 2" headers (25-1061) for the CTS-V?
The primary tube diameter is the key difference. The 1-7/8" headers are a strong choice for most street and performance builds. The 2" headers deliver maximum exhaust flow for more aggressive builds with supporting modifications such as a larger supercharger, cam, or heads.
What is the difference between these headers and the Gen 2 CTS-V X-pipe kit (25-1049)?
Part 25-1046 is the 1-7/8" longtube headers for the 2016–2019 Gen 3 CTS-V with the 6.2L LT4 supercharged engine. Part 25-1049 is the X-pipe kit only for the 2009–2015 Gen 2 CTS-V with the 6.2L LSA supercharged engine. These are completely different engine generations requiring different components.
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 2016–2019 CTS-V LT4 applications compared to stock exhaust manifolds.
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.
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).
