This Gibson GP400S stainless performance headers replace factory manifolds on 1991-1999 Jeep Cherokee, Grand Cherokee and Wrangler models with 4.0L engines. Dyno-tuned design delivers more horsepower and torque at low and mid-range RPM for better highway performance. Mandrel-bent 1-1/2 inch tubing improves exhaust flow, engine breathing and reduces operating temperatures while retaining the stock crossover pipe.
Key Features
- Stainless Steel Construction: 16-gauge 1-1/2 inch primaries with 3/8-inch heavy-duty laser-cut port flanges prevent warping and leaks.
- Direct Bolt-On Fit: Replaces stock manifolds using OEM connections and stock crossover, no welding or cutting required.
- 1-1/2 inch diameter 16-gauge T-304 stainless steel tubing for corrosion resistance and optimal flow.
- Dyno-Tuned Performance: Engineered for maximum usable power and torque gains at everyday driving RPMs with improved throttle response.
- Stainless steel resists corrosion for long-term durability in harsh conditions.
- Bolt-on design fits directly with provided hardware and gaskets.
Fitment
| Years | Make | Model | Application |
|---|---|---|---|
| 1991-1999 | Jeep | Cherokee | 4.0L |
| 1993-1999 | Jeep | Grand Cherokee | 4.0L |
| 1991-1999 | Jeep | Wrangler | JK, 4.0L |
Specifications
| Manufacturer | Gibson |
|---|---|
| Manufacturer Part Number | GP400S |
| Product Type | Headers &, Manifolds |
| Fitment Type | Vehicle specific |
| Tubing Diameter | 1.50-in. Stainless 16-gauge mandrel bent tubing. |
| Header Features | Long Tube Style Header, Direct Fit, Bolt-On, Heavy duty laser cut flanges, Premium gaskets and all hardware included, No Welding, Attaches to the OEM crossover pipe |
| Footnote | Emission Compliant Carb EO# D-411-12 |
| Warranty | Lifetime Limited Warranty |
What's Included
- One new Gibson headers &, manifolds in the exact configuration identified by manufacturer part number GP400S
- Hardware and accessories only when supplied for this exact part number
About Gibson
Gibson develops vehicle-specific and universal exhaust components for street, truck, SUV, and performance applications. Selection and installation requirements remain exact-part-number specific.
Related Gibson Products
- Gibson 00-03 Dodge Dakota Base 4.7L 1-1/2in 16 Gauge Performance Header - Stainless
- Gibson 96-98 Chevrolet C1500 Base 5.0L 1-1/2in 16 Gauge Performance Header - Stainless
- Gibson 02-03 Dodge Ram 1500 SLT 4.7L 1-1/2in 16 Gauge Performance Header - Stainless
Browse the Gibson collection for related exhaust systems and components.
Frequently Asked Questions
Which vehicles fit Gibson GIBGP400S?
Gibson GIBGP400S is listed for 1991-1999 Jeep Cherokee, 1991-1999 Jeep Wrangler, and 1993-1999 Jeep Grand Cherokee. Confirm the exact engine, trim, drivetrain, body or cab configuration, exhaust layout, and every application note before ordering.
What should I verify before ordering Gibson GIBGP400S?
Match the exact part number, system type, material, finish, tubing and connection diameters, exhaust configuration, package contents, and current manufacturer notes shown in this listing.
What should be checked when installing Gibson GIBGP400S?
Verify all interfaces, hanger positions, tip and body clearances, clamp or fastener torque, leak-free operation, and local emissions requirements. Reinspect the system after its first heat cycle.
Installation Instructions
Follow the current Gibson instructions and vehicle service information for this exact part number. Work on a cool exhaust, support the vehicle safely, confirm all interfaces and clearances, align the system before final tightening, test for leaks, and inspect the installation again after the first heat cycle.
Exhaust Systems
Shop performance exhaust systems, cat-backs, axle-backs, headers, mufflers, and exhaust tips at Black Ops Auto Works. Compare options from Borla, CORSA, Solo Performance, AWE, MagnaFlow, MBRP, Kooks, Akrapovic, Invidia, and other brands. Find complete systems and individual components for muscle cars, performance SUVs, trucks, imports, and European vehicles. Cat-Back and Axle-Back Exhaust Systems Choose the exhaust section that matches your project. Cat-back systems generally replace the exhaust downstream of the catalytic converter, while axle-back systems replace the rear section. Exact connection points and package contents vary by vehicle. Compare muffler design, pipe diameter, exit location, tip configuration, and compatibility with existing exhaust components. Exhaust for HEMI, SRT, Trackhawk, and Hellcat Vehicles This collection includes exhaust options for selected Jeep Grand Cherokee SRT and Trackhawk, Dodge Durango SRT and Hellcat, Dodge Charger, Chrysler 300, and Ram appl...
View Exhaust Systems Products
Gibson
Shop Gibson Performance Exhaust cat-back systems, axle-back systems, mufflers, tips, headers, and installation components at Black Ops Auto Works. Compare vehicle-specific exhaust packages and universal components by application, material, pipe layout, and manufacturer part number. Gibson Cat-Back Exhaust SystemsThe collection includes selected Single, Dual Sport, Dual Split, Dual Extreme, and Super Truck configurations for supported trucks, SUVs, and other vehicles. These names identify different exhaust arrangements, with application-specific pipe routing and exit locations.Match model year, engine, drivetrain, wheelbase, cab, and bed or body length. An extended-wheelbase SUV or pickup can require a different system from another version of the same model. Check factory exhaust connections, bumper openings, spare-tire space, and any hitch or suspension changes. Stainless, Aluminized, and Black Elite OptionsGibson listings include specified stainless-steel and aluminized constructio...
View Gibson Products
Headers & Manifolds
Performance headers and exhaust manifolds for gas and diesel platforms are stocked at Black Ops Auto Works. Shop long-tube headers, shorty headers, turbo manifolds, and diesel exhaust manifolds for Mustang, Camaro, Ram HEMI trucks, Ford Powerstroke, Dodge Cummins, and GM Duramax platforms. Every product is filterable by tube diameter, header length, and vehicle year, make, model, and engine so the correct fitment ships the first time. Black Ops Auto Works carries 459 header and manifold SKUs across gas and diesel applications. What This Category Covers Performance headers and exhaust manifolds are among the most effective bolt-on upgrades for improving exhaust scavenging, increasing horsepower, and giving your engine a more aggressive exhaust note. Whether you are building a street machine, a track car, or a diesel work truck, the right header or manifold set unlocks real performance gains across the RPM range. Long-Tube Versus Shorty Headers Long-tube headers route exhaust prim...
View Headers & Manifolds Products
Jeep Cherokee Parts and Accessories
Shop Jeep Cherokee floor liners, cargo protection and interior accessories by exact generation and body. Earlier XJ and later Cherokee applications need separate checks. Seat Rows and Cargo Coverage Compare the listed 1984–2001 applications with later 2014–2022 designs separately. Match actual floor contour, seats, retention points and two- or four-door coverage where stated. Choose front, second-row and cargo protection by the areas expressly supplied. A cargo liner is separate from rear passenger-floor coverage. Dash Panel and Interior Interfaces For a gauge panel, verify exact dash application, mounting and specified instrument openings. Panel inclusion does not establish that gauges, senders or wiring are supplied. Record steering, console or interior conversions affecting the installation. A shared TJ/XJ title needs exact Cherokee coverage and actual dimensions before selection. Choose Your Part Identify exact generation, year and door layout. Match floor contours and required...
View Jeep Cherokee Parts and Accessories Products
Jeep Grand Cherokee Parts and Accessories
Shop Jeep Grand Cherokee composite body panels and adjustable suspension components by exact generation and trim. Compare each hood, spoiler, link or arm using its own production coverage. WK2 Hoods and Composite Choices The listed 2011–2021 Sniper hood offers fiberglass and carbon-fiber configurations. Preserve its EcoDiesel exclusion and review transferred factory pieces, vent requirements and finish preparation before choosing a version. Match Demon, CFR and other panels by their exact product application rather than extending Sniper coverage to every design. Spoilers and replacement hatches have separate mounting and production requirements. Alignment Arms and Links The listed front upper arms target 2017–2021 SRT/Trackhawk applications and use adjustment tabs for camber and caster. Confirm actual trim, ride height and measured alignment needs. Compare front arms, rear arms, toe links and sway-bar links by position and adjustment function. Review pair or individual quantities an...
View Jeep Grand Cherokee Parts and Accessories ProductsJeep Wrangler Parts & Accessories
Plan a Jeep Wrangler parts selection by generation, door count, engine and intended use. Compare the actual build requirements before selecting suspension, body or powertrain components. Generation and Build Configuration Identify JK or JL explicitly for a 2018 Wrangler, and record two-door or four-door body and trim. Year alone does not establish which generation’s parts are needed. For modified vehicles, document lift height, wheel dimensions, tire size and axle changes. Use the installed configuration when checking mounting and clearance. Installation and Supporting Components For suspension work, compare required travel, geometry, brake-line routing and supporting parts. Review the complete kit and specified alignment procedure rather than assuming every lift has the same contents. For intake or exhaust inquiries, provide exact engine and body configuration and the proposed manufacturer part number. Compare connection layout, routing and current application before checking avail...
View Jeep Wrangler Parts & Accessories Products
Jeep Wrangler Parts and Accessories
Shop Jeep Wrangler liners, headliners, hood protectors and window accessories using exact generation and body. Match each package’s production range, door count and installation configuration. Floor, Tub and Headliner Coverage Compare floor and tub liners with headliners as separate products. Review whether tailgate coverage or heat shields are supplied, and identify the exact area protected. The listed TJ/LJ packages include console and heat-shield distinctions. JK two-door and JKU four-door applications, as well as early and later JK ranges, should remain separate. Hood and Window Applications Match hood protectors to TJ, JK or JL profile and production. One generation’s hood accessory does not establish fit on another. For window deflectors, compare door count, attachment and supplied pieces. Choose the specific package for the intended body rather than assuming every Wrangler set covers the same windows. Choose Your Part Record generation, year and door count. Identify console,...
View Jeep Wrangler Parts and Accessories Products


