Completing your LS or LT swap exhaust system on your 2WD OBS C1500? Speed Engineering's true dual X-pipe kit is the purpose-built connection between your Speed Engineering longtube headers and the rest of your exhaust system. Built from 3" mandrel bent 304 natural stainless steel with a true dual X-pipe crossover design, stainless band clamps, and transmission extensions for 6 and 8 speed automatics included. An optional wideband O₂ bung is available for tuning applications.
⚠️ Important Notes:
- Designed to work with Speed Engineering LS or LT swap longtube headers only — will NOT work with factory exhaust manifolds or any other brand of headers
- Requires a modified or aftermarket crossmember for installation — compatible with Suspension Engineering transmission crossmember with required shims (4L60 will need 3 shims)
- 2WD applications only
Features:
- 3" Mandrel Bent Tubing — Consistent diameter throughout for maximum exhaust flow
- True Dual X-Pipe Design — Balances exhaust pulses between banks for improved tone and mid-range power
- Extensions for 6 and 8 Speed Automatic Transmissions — Included for proper fitment with modern transmission swaps
- Optional Wideband O₂ Bung — Available for wideband O₂ sensor placement for tuning applications
- 3" Stainless Band Clamps Included
- 304 Natural Stainless Steel Construction — Corrosion resistant, heat tolerant, and built to last
- Compatible with 4, 6, and 8 Speed Automatic Transmissions
- Compatible with 4.8L, 5.3L, 6.0L, and 6.2L LS and LT Engines
- V8 Engines Only
- Dyno Proven
Vehicle Applications:
Note: 2WD applications only. Designed for use with Speed Engineering LS or LT swap longtube headers only.
Chevrolet C1500 Truck (2WD) — GMT400 OBS
- 1988 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1989 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1990 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1991 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1992 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1993 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1994 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1995 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1996 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1997 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1998 Chevrolet C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
GMC C1500 Truck (2WD) — GMT400 OBS
- 1988 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1989 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1990 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1991 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1992 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1993 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1994 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1995 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1996 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1997 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
- 1998 GMC C1500 Truck (2WD) — 4.8L/5.3L/6.0L/6.2L LS/LT Swap
Frequently Asked Questions:
Q: Will this X-pipe kit work with my factory exhaust manifolds? No. This system is designed to work exclusively with Speed Engineering LS or LT swap longtube headers. It will not work with factory exhaust manifolds or any other brand of headers.
Q: Does this kit require crossmember modifications? Yes. This kit requires a modified or aftermarket crossmember for proper installation. It is compatible with the Suspension Engineering transmission crossmember with required shims — a 4L60 transmission will need 3 shims.
Q: What transmissions is this kit compatible with? This kit is compatible with 4, 6, and 8 speed automatic transmissions. Extensions for 6 and 8 speed transmissions are included.
Q: Is a wideband O₂ bung included? An optional wideband O₂ bung is available for wideband O₂ sensor placement for tuning applications.
Q: What size tubing does this kit use? All tubing is 3" diameter, mandrel bent for consistent flow throughout.
Q: What engines is this kit compatible with? This kit is compatible with 4.8L, 5.3L, 6.0L, and 6.2L LS and LT V8 engines used in 1988–1998 C1500 swap applications.
Q: Is this kit street legal? No. This is a race-only product 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).
