1987-1990 Jeep Wrangler 4.2L 6 Cyl AMC 258 Exhaust Header

Exhaust Headers For 1987-1990 Jeep Wrangler 4.2L 6 Cyl AMC 258 Engines

Upgrade your Jeep with this high-performance AMC 258 header, designed for 1987–1990 Jeep Wrangler 4.2L 6-cylinder engines. Crafted from polished stainless steel with mandrel-bent 1.50" tubes and a 2.00" collector, it improves exhaust flow, boosts horsepower, and enhances engine sound. Direct bolt-on fit—no modifications needed.

Specifications:

Brand Name: FLASHARK
Certificate: ISO9001:2000
Application: Automobile Exhaust Header
Material: Stainless Steel
Surface: Mirror Polish
Tube Diameter: 1.50"
Collector Diameter: 2.00"

Exhaust Header VS Manifold, which is the better choice?

The structural differences between exhaust headers and manifolds mainly lie in material and design. Exhaust headers are made of lighter, thinner steel, while manifolds are typically built from thick cast iron. Headers are also longer, and because each engine cylinder is connected to its own individual tube, they help reduce back pressure—unlike manifolds, which often restrict exhaust flow and decrease performance.

By minimizing back pressure, exhaust headers improve engine efficiency, allowing exhaust gases to exit more freely. This results in better performance, increased horsepower, and enhanced sound—making headers the better choice over traditional manifolds, especially for engines like the AMC 258 4.2L 6-cylinder found in the 1987–1990 Jeep Wrangler.

Upgrading or replacing your exhaust header is essential for those looking to boost both engine output and exhaust tone. Whether you're on the street or off the trail, FLASHARK offers a range of performance headers to meet your needs. Our designs are direct bolt-on, requiring no modifications, making installation quick and convenient.

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In addition to purchasing this product, Flashark highly recommends that you purchase Flashark and Spelab's new collaborative product, the silicone coolant hose kit; to replace the stock rubber coolant hose in your car's cooling system.

Are silicone coolant hoses better? Coolant hoses transport the coolant—a mixture of water and antifreeze—from the engine to the radiator and back. The coolant absorbs heat from the engine block and heads and then releases this heat through the radiator, where airflow dissipates it away from the vehicle. This continuous flow is crucial for preventing engine overheating, which can lead to severe damage or failure.