Toyota LandCruiser FJ62 FJ73 FJ75 4.0L 3F Headers – Wildcat WILD137

Wildcat WILD137 exhaust headers (extractors) are designed for selected Toyota LandCruiser FJ62, FJ73 and FJ75 models fitted with the 4.0L 3F petrol six-cylinder engine, with the WILD137 application specified for 1984–1988.

Featuring an interference-style extractor design, WILD137 replaces the restrictive factory exhaust manifold with larger, smoother-flowing pipework. The design helps improve exhaust gas flow and scavenging to reduce restriction and improve torque, throttle response and overall engine performance.

The headers are designed for inside-chassis fitment, making them particularly well suited to LandCruisers used for street driving, touring, towing and recreational 4WD use.

Please check availability before ordering.

Key Features

• Designed for selected Toyota LandCruiser FJ62, FJ73 and FJ75 models
• Suits the 4.0L 3F OHV petrol six-cylinder engine
• Interference-style design for street and 4WD performance
• 1.58" primary pipes
• 2.00" secondary pipes
• 2.50" outlet
• Inside-chassis fitment
• Designed to improve exhaust flow, torque, throttle response and engine performance

Construction

• Australian-made Wildcat performance headers
• Quality mild steel construction
• Strong welded construction for durability
• Heat-resistant painted finish rated to approximately 600°C
• Precision mounting flange for reliable cylinder-head sealing

Additional Options

• Replacement exhaust manifold/header gasket available where required
• 2.50" exhaust components available for performance exhaust upgrades
• Replacement manifold studs, nuts and exhaust mounting hardware available where required

Vehicle Fitment

• Make: Toyota
• Model: LandCruiser
• Chassis: FJ62 / FJ73 / FJ75
• Engine: 3F OHV petrol
• Capacity: 4.0L / 3956cc
• Cylinders: Inline 6
• WILD137 Application: 1984–1988

Fitment Notes

• Designed for selected LandCruiser FJ62, FJ73 and FJ75 models fitted with the 3F petrol engine
• WILD137 is specified for the 1984–1988 application
• Designed for inside-chassis fitment
• Suitable for applicable manual and automatic transmission vehicles
• Inspect engine mounts, steering components and exhaust mounting points before installation
• Please confirm chassis, engine and build date before ordering
• Please check availability before ordering.

What’s Included

• Wildcat WILD137 header / extractor assembly

Recommended With

• New exhaust manifold/header gasket
• Replacement manifold studs and nuts where existing hardware is worn or corroded
• 2.50" exhaust components where upgrading the remainder of the exhaust system
• Professional exhaust installation

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 3956cc 3F engine draws in approximately 7,912 litres of intake air per minute and expels around 23,736 litres of hot exhaust gas per minute at approximately 600°C. A well-designed header and exhaust system helps manage this high gas flow efficiently, reducing restriction and improving exhaust scavenging, torque, throttle response and engine performance.

Installation Tips

Apply penetrating lubricant such as WD-40 or similar to the manifold studs, nuts and exhaust fasteners before removal. Inspect engine mounts, steering components and exhaust mounting points before installation. Trial-fit the headers and check inside-chassis clearance before fully tightening the system. Retighten accessible fasteners after the first complete heat cycle.

Warranty & Compliance

Wildcat headers are covered by the manufacturer's warranty subject to standard warranty terms and conditions.

Installation must retain any emissions-control equipment required for the vehicle. Exhaust and emissions requirements vary between Australian states and territories, and the completed installation must comply with the regulations applicable in your state or territory.

FAQ

What Toyota LandCruiser models does WILD137 suit?
WILD137 is designed for selected Toyota LandCruiser FJ62, FJ73 and FJ75 models fitted with the 4.0L 3F petrol engine, with this header application specified for 1984–1988.

Do the headers fit inside the chassis?
Yes. WILD137 is designed for inside-chassis fitment, helping maintain ground clearance for touring and recreational off-road use.

What size are the header pipes?
WILD137 uses 1.58" primary pipes, 2.00" secondary pipes and a 2.50" outlet.

Will WILD137 improve towing performance?
The interference-style header design is intended to reduce exhaust restriction and improve scavenging, which can improve usable low and mid-range torque and throttle response. Actual results depend on the condition and specification of the engine and complete exhaust system.

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

For phone orders, fitment advice or product enquiries, contact Best Mufflers:

Call Now: +61 2 9547 3511 Email Us

Best Mufflers
87A Planthurst Road, Carlton NSW 2218, Australia
Monday–Friday 8:00am–5:00pm by appointment
Exhaust Systems Since 1983