Swapping a GM LS engine into your Fox Body or SN95 Mustang? Speed Engineering's 1-7/8" LS swap longtube headers are built specifically for these platforms — mandrel bent, TIG-welded, and CNC-machined for a precise fit across both the 1979–1993 Fox Body and 1994–2004 SN95 Mustang chassis. Compatible with the full LS engine family from 4.8L through 6.2L including LS1, LS2, LS3, LS6, and LSA. Dyno proven to deliver over 25 rear-wheel horsepower over stock manifolds.
Built from 304 natural stainless steel with merge spikes and standard graphite manifold gaskets included.
⚠️ Important Installation Notes:
- GM LS engine swaps only — these headers are NOT designed for Ford engines of any kind
- These headers have only been tested successfully with AJE Motor Mounts, Flaming River Steering Shafts, and AJE K-Members — compatibility with other combinations is unknown and not guaranteed
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 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 LS applications
- Compatible with 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, and LSA Engines
- V8 Engines Only
Vehicle Applications:
Note: All applications listed are GM LS engine swap conversions. These headers are not compatible with Ford engines.
Ford Mustang — Fox Body (RWD)
- 1979 Ford Mustang (RWD) — LS Swap
- 1980 Ford Mustang (RWD) — LS Swap
- 1981 Ford Mustang (RWD) — LS Swap
- 1982 Ford Mustang (RWD) — LS Swap
- 1983 Ford Mustang (RWD) — LS Swap
- 1984 Ford Mustang (RWD) — LS Swap
- 1985 Ford Mustang (RWD) — LS Swap
- 1986 Ford Mustang (RWD) — LS Swap
- 1987 Ford Mustang (RWD) — LS Swap
- 1988 Ford Mustang (RWD) — LS Swap
- 1989 Ford Mustang (RWD) — LS Swap
- 1990 Ford Mustang (RWD) — LS Swap
- 1991 Ford Mustang (RWD) — LS Swap
- 1992 Ford Mustang (RWD) — LS Swap
- 1993 Ford Mustang (RWD) — LS Swap
Ford Mustang — SN95 (RWD)
- 1994 Ford Mustang (RWD) — LS Swap
- 1995 Ford Mustang (RWD) — LS Swap
- 1996 Ford Mustang (RWD) — LS Swap
- 1997 Ford Mustang (RWD) — LS Swap
- 1998 Ford Mustang (RWD) — LS Swap
- 1999 Ford Mustang (RWD) — LS Swap
- 2000 Ford Mustang (RWD) — LS Swap
- 2001 Ford Mustang (RWD) — LS Swap
- 2002 Ford Mustang (RWD) — LS Swap
- 2003 Ford Mustang (RWD) — LS Swap
- 2004 Ford Mustang (RWD) — LS Swap
Frequently Asked Questions:
Q: Will these headers work with my Ford engine? No. These headers are designed for GM LS engine swaps only and are not compatible with Ford engines of any kind.
Q: What motor mounts and K-member are required for these headers? These headers have only been tested successfully with AJE Motor Mounts, Flaming River Steering Shafts, and AJE K-Members. Compatibility with other motor mount and K-member combinations is unknown and not guaranteed.
Q: What LS engines are these headers compatible with? These headers are compatible with GM LS V8 engines including 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, and LSA.
Q: Do these fit both Fox Body and SN95 Mustang chassis? Yes. These headers fit both the 1979–1993 Fox Body and 1994–2004 SN95 Ford Mustang platforms.
Q: How much horsepower do these headers add? Speed Engineering's 1-7/8" LS swap longtube headers are dyno proven to add over 25 rear-wheel horsepower compared to stock exhaust manifolds on LS applications.
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 with the headers.
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).