Wildcat Headers WILD023 – Jeep Wrangler 4.0L 1996-On

Wildcat WILD023 exhaust headers (extractors) are designed for selected Jeep Wrangler models from 1996-on fitted with the 4.0L inline six-cylinder petrol engine.

Manufactured in Australia, WILD023 features an interference header design for street performance applications. The combination of 1.50" primary pipes, 2.00" secondary pipes and a 2.50" outlet is designed to improve exhaust scavenging, reduce exhaust restriction and improve usable torque, throttle response and engine performance.

WILD023 is listed for compatible manual and automatic transmission applications and is designed as a direct-fit replacement for the specified Wrangler application.

Key Features

• Check availability before ordering
• Australian made Wildcat performance headers
• Interference design for street performance applications
• Designed for selected Jeep Wrangler 4.0L six-cylinder applications
• Suitable for listed manual and automatic transmissions
• 1.50" primary pipes
• 2.00" secondary pipes
• 2.50" outlet
• Direct-fit design for the specified application
• Designed to improve exhaust flow, torque, throttle response and engine performance

Vehicle Fitment

• Make: Jeep
• Model: Wrangler
• Year Range: 1996-On
• Engine: 4.0L Inline 6-Cylinder Petrol
• Original Application Reference: 1J4F
• Transmission: Manual / Automatic

Header Specifications

• Brand: Wildcat
• Part Number: WILD023
• Header Design: Interference
• Primary Pipe Size: 1.50"
• Secondary Pipe Size: 2.00"
• Outlet Size: 2.50"
• Installation: Direct Fit
• Finish: Heat-resistant paint rated to 600°C
• Application: Street Performance
• Manufacture: Australian Made

Construction

• High-quality steel tubing with strong welded construction
• Formed pipework designed for efficient exhaust gas flow
• Heat-resistant paint finish rated to 600°C for added protection and durability
• Australian made

Additional Options

• DSF804G: Exhaust manifold/header gasket – available separately
• High-temperature exhaust gasket sealant
• Replacement manifold studs and nuts where required

Fitment Notes

What's Included

• Wildcat WILD023 header / extractor assembly
• Outlet connection components as supplied

Recommended With

• DSF804G exhaust manifold/header gasket – sold separately
• High-temperature exhaust gasket sealant
• Replacement manifold studs and nuts where required

Installation Tips

• Lubricate manifold studs, nuts and exhaust fasteners with WD-40 or a similar penetrating lubricant before removal.
• Remove all traces of the old manifold gasket before installing the headers.
• Inspect the cylinder-head sealing surface, manifold studs and threads before installation.
• Fit a new DSF804G gasket and use high-temperature exhaust sealant where recommended.
• Trial-fit the headers before fully tightening the fasteners.
• Check clearance around steering, starter motor, transmission, engine mounts and bodywork.
• Protect the painted header surfaces during installation.
• Re-tighten the header/manifold bolts after approximately 500km to help maintain a reliable gasket seal.

Why Good Headers & Exhaust Systems Matter

• At approximately 85% volumetric efficiency, the 4.0L inline six-cylinder engine at 4,000rpm moves approximately 6,800L/min intake airflow and can expel around 20,400L/min hot exhaust gas
• At higher rpm and under increased engine load, exhaust volume increases significantly due to engine demand and hot-gas expansion
• Efficient headers improve scavenging, reduce exhaust restriction, and support usable horsepower, torque and throttle response

Warranty & Compliance

Frequently Asked Questions

Which Jeep Wrangler does WILD023 suit?
WILD023 is listed for selected Jeep Wrangler models from 1996-on fitted with the 4.0L inline six-cylinder petrol engine.

Does WILD023 fit manual and automatic Wranglers?
Yes. WILD023 is listed for compatible manual and automatic transmission applications.

Is WILD023 direct fit?
Yes. WILD023 is listed as a direct-fit header for the specified compatible Wrangler application.

What size are WILD023 headers?
WILD023 uses 1.50" primary pipes, 2.00" secondary pipes and a 2.50" outlet.

Which gasket does WILD023 use?
The recommended exhaust manifold/header gasket is DSF804G, sold separately.

What finish is used on WILD023?
The headers have a heat-resistant paint finish rated to 600°C.

Are these headers Australian made?
Yes. WILD023 Wildcat Headers are Australian made.

Can I pick up from the store?
Yes. Pick up is available but must be pre-arranged before collection.

How much is freight?
Freight varies depending on your delivery location and where stock is available. Please contact us for freight charges before ordering. Where possible, we can arrange dispatch from the nearest available product location to help reduce freight costs and delivery times.

Do you ship to the USA?
Yes. Best Mufflers regularly ships exhaust systems and exhaust parts to customers throughout the United States.

Please note that import duties, tariffs, taxes, and customs clearance fees are not included in the product or shipping price. Once your order is processed and the applicable charges are calculated, we will send you a secure payment link to finalise the import duties and tariff charges before dispatch.

Customer Support

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