Toyota LandCruiser BJ40 BJ42 3.0L 3.4L Diesel Headers – Wildcat WILD147

Wildcat WILD147 exhaust headers (extractors) are designed for selected Toyota LandCruiser BJ40 and BJ42 models fitted with the 3.0L B or 3.4L 3B inline 4-cylinder diesel engine.

Featuring an interference-style header design, WILD147 uses 44.5mm (1.75") primary pipes, 50.8mm (2.00") secondary pipes and a 57.1mm (2.25") outlet. The header configuration is designed to improve exhaust gas flow and scavenging while maintaining good exhaust velocity, making it particularly suitable for the low- and mid-range torque requirements of a diesel LandCruiser.

Australian-made Wildcat headers provide a practical exhaust upgrade for BJ40 and BJ42 LandCruisers used for street driving, touring, towing and off-road applications.

Please check availability and current lead time before ordering.

Key Features

• Designed for selected Toyota LandCruiser BJ40 and BJ42 applications
• Suits the 3.0L B diesel engine
• Suits the 3.4L 3B diesel engine
• Interference-style design for street and off-road performance applications
• 44.5mm (1.75") primary pipes
• 50.8mm (2.00") secondary pipes
• 57.1mm (2.25") collector outlet
• Designed to improve exhaust flow, torque, throttle response and engine performance

Construction

• Australian-made Wildcat performance headers
• Heavy-duty mild steel construction
• Strong welded construction for durability
• Designed for the engine bay and chassis clearances of applicable BJ40 / BJ42 models
• Heat-resistant painted finish rated to approximately 600°C

Additional Options

• RBG147S: Exhaust manifold/header gasket available separately
• Replacement manifold studs, nuts and exhaust hardware where required
• Performance exhaust system where further exhaust flow improvement is required

Vehicle Fitment

• Make: Toyota
• Model: LandCruiser
• Series: BJ40 / BJ42 – selected applications
• Engine: B – 3.0L inline 4-cylinder diesel
• Engine: 3B – 3.4L inline 4-cylinder diesel

Fitment Notes

• Designed for selected Toyota LandCruiser BJ40 and BJ42 applications
• Suits the 3.0L B and 3.4L 3B diesel engines
• Recommended exhaust manifold/header gasket: RBG147S
• Older LandCruisers are commonly modified or fitted with replacement engines, transmissions and exhaust systems, so the vehicle configuration should be checked before ordering
• Check clearance around the engine mounts, steering, chassis and surrounding components during installation
• Please check availability and current lead time before ordering.

What’s Included

• 1 x Wildcat WILD147 header / extractor assembly
• Outlet connection components as supplied

Recommended With

• RBG147S exhaust manifold/header gasket
• Replacement manifold studs and nuts where existing hardware is worn or corroded
• High-temperature exhaust gasket sealant where appropriate
• Quality performance exhaust system where further exhaust flow improvement is required

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 3.0L B diesel engine theoretically draws in approximately 6,000 litres of intake air per minute and can expel around 18,000 litres of hot exhaust gas per minute at approximately 600°C.

The larger 3.4L 3B diesel engine theoretically draws in approximately 6,800 litres of intake air per minute and can expel around 20,400 litres of hot exhaust gas per minute under the same theoretical conditions.

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
• Remove all traces of the old manifold gasket before installing the header
• Inspect the cylinder-head sealing surface, studs and threads before installation
• Fit a new RBG147S exhaust manifold/header gasket
• Trial-fit the header before fully tightening the mounting hardware
• Check clearance around the engine mounts, steering, chassis and surrounding components
• Protect the painted surfaces during trial fitting and installation
• Check all exhaust connections for leaks after installation
• Inspect and re-tighten the mounting hardware after the initial heat cycles

Warranty & Compliance

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

Correct installation and adequate clearance around the engine mounts, steering, chassis and surrounding components are essential. Engine conversions and other vehicle modifications may affect fitment.

FAQ

Which Toyota LandCruiser models does WILD147 suit?
WILD147 is designed for selected Toyota LandCruiser BJ40 and BJ42 applications fitted with compatible B-series diesel engines.

Which engines does WILD147 suit?
WILD147 is designed for the 3.0L B and 3.4L 3B inline 4-cylinder diesel engines.

What size are the WILD147 header pipes?
WILD147 uses 44.5mm (1.75") primary pipes, 50.8mm (2.00") secondary pipes and a 57.1mm (2.25") outlet.

Which gasket does WILD147 use?
The recommended exhaust manifold/header gasket is RBG147S, available separately.

Are WILD147 headers suitable for off-road use?
WILD147 is designed for applicable BJ40 and BJ42 LandCruisers used for street, touring, towing and off-road applications. Vehicle modifications and individual operating conditions should always be considered.

What finish is used on WILD147?
The headers have a heat-resistant painted finish rated to approximately 600°C.

Are WILD147 headers Australian made?
Yes. Wildcat WILD147 headers are manufactured in Australia.

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