GIBSON HEADER 91-99 4.0L STAINLESS
Enhance the performance and reliability of Jeep's legendary inline-six engine with the Gibson Stainless Steel Header. Designed specifically for 1991–1999 Jeep Wrangler YJ and TJ, Cherokee XJ, Grand Cherokee ZJ, and Grand Cherokee WJ models equipped with the 4.0L gasoline engine, this performance header replaces the restrictive factory exhaust manifold with a high-flow tubular design engineered to improve exhaust efficiency and engine breathing.
Constructed from premium stainless steel, the GP400S delivers outstanding resistance to corrosion, rust, and the extreme temperatures generated by the exhaust system. Its tuned runner design promotes improved exhaust scavenging and reduced backpressure, helping support gains in horsepower, torque, and throttle response across the RPM range. Built for long-term durability and dependable performance, this header also serves as an excellent replacement for aging or cracked factory manifolds. Whether restoring lost performance or upgrading for improved engine efficiency, the Gibson Stainless Steel Header delivers the quality craftsmanship and proven engineering Jeep enthusiasts expect.
Performance Header Upgrade: Replaces restrictive factory exhaust manifolds with a tuned tubular header designed to improve exhaust flow and engine efficiency.
Legendary 4.0L Jeep Fitment: Engineered for 1991–1999 Jeep Wrangler YJ and TJ, Cherokee XJ, Grand Cherokee ZJ, and Grand Cherokee WJ models equipped with the 4.0L inline-six gasoline engine.
Premium Stainless Steel Construction: Manufactured from high-quality stainless steel for superior corrosion resistance, strength, and long-term durability.
Improved Exhaust Scavenging: Tuned primary tubes help reduce backpressure and promote smoother exhaust flow for enhanced horsepower, torque, and throttle response.
Direct-Fit Performance Design: Engineered for reliable installation and seamless integration with compatible exhaust system components.
| Manufacturers Part Number | GP400S |
|---|---|
| Product Name | GIBSON HEADER 91-99 4.0L STAINLESS |
| Dropdown Value 1 | GIBSON HEADER 91-99 4.0L STAINLESS |
| CARB E.O. Number | D-411-8 |
| CARB Certification | 50 State Legal (Requires E.O. number) |
| Length | 19 |
| Width | 16 |
| Depth | 8 |
| Weight | 30.000000 |
| Hazmat | No |
| Brand | Gibson |
| Color | Silver |
| Engine | 6cyl 4.0L |
| Included Parts |
|
| Material | Stainless Steel |
| Item Returns | This item can be returned |
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