Speed Engineering 1-7/8" Longtube Headers & Y-Pipe Full Kit for LS Swapped 1988–1998 Silverado / Sierra K1500 4WD Truck 4.8L, 5.3L, 6.0L applications.
This complete bolt-on system replaces the restrictive factory exhaust manifolds and mid-pipes with free-flowing stainless longtubes and a 3" off-road Y-pipe that connects directly to the existing cat-back location. Designed for significant horsepower gains, aggressive exhaust tone, and long-lasting durability.
⚠️ 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) 3" Off-Road Y-Pipe / Connection Pipe
- (1) Set of Zinc-Coated Header Bolts (or stainless ARP bolts if selected)
- (2) MLS Exhaust Gaskets
Plug Wires and Sleeves can be added to the kit if selected.
Speed Engineering Silverado & Sierra longtube headers are made out of 304 stainless steel and offer great quality, performance, and affordability. Our Silverado & Sierra longtube headers are mandrel bent, tig welded, and feature natural stainless steel construction. All of our Silverado & Sierra longtube headers have been dyno proven. We stand behind our Silverado & Sierra longtube headers in saying you will not find a better fitting, quality built, budget header for your vehicle.
Kit Includes:
- Pair of Longtube Headers
- Off-Road Y Pipe
- Zinc Coated Header Bolts
- Pair of MLS Gaskets
Features include:
- Mandrel Bent Tubing
- Merge Spikes
- Race Version with "NO" Air & EGR Fittings
- Full 1 7/8" Primaries
- 3" Collector
- Longtube Header Design
- LS Swap Conversion Header
- Gains over 25+ rwhp
- LS V8 Engines Only
- 4.8L, 5.3L, 6.0L, 6.2L, LS1, LS2, LS3, LS6, LSA Engines
- CNC Machined Flanges
- 304 Natural Stainless Steel
- Standard Graphite Manifold Gaskets
Vehicle Applications:
1988 Chevrolet K1500 Truck (4WD)
1989 Chevrolet K1500 Truck (4WD)
1990 Chevrolet K1500 Truck (4WD)
1991 Chevrolet K1500 Truck (4WD)
1992 Chevrolet K1500 Truck (4WD)
1993 Chevrolet K1500 Truck (4WD)
1994 Chevrolet K1500 Truck (4WD)
1995 Chevrolet K1500 Truck (4WD)
1996 Chevrolet K1500 Truck (4WD)
1997 Chevrolet K1500 Truck (4WD)
1998 Chevrolet K1500 Truck (4WD)
1988 GMC K1500 Truck (4WD)
1989 GMC K1500 Truck (4WD)
1990 GMC K1500 Truck (4WD)
1991 GMC K1500 Truck (4WD)
1992 GMC K1500 Truck (4WD)
1993 GMC K1500 Truck (4WD)
1994 GMC K1500 Truck (4WD)
1995 GMC K1500 Truck (4WD)
1996 GMC K1500 Truck (4WD)
1997 GMC K1500 Truck (4WD)
1998 GMC K1500 Truck (4WD)
NOTE: WILL NOT FIT ON 2WD APPLICATIONS!
NOTE: ONLY WORKS ON 4 WHEEL DRIVE 1/2 TON CHASSIS!!!
Note: If using a larger 4L80E transmission the bellhousing ears may need to be trimmed for proper clearance.
Note: Our Y pipe kit might require modifications for attaching to the factory exhaust.
(Warning) This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability.
GMT400 OBS