Toyota LandCruiser HZJ80 4.2L 1HZ Diesel Headers – Wildcat WILD723

Wildcat WILD723 exhaust headers (extractors) are designed for the Toyota LandCruiser HZJ80 80 Series fitted with the 4.2L 1HZ naturally aspirated six-cylinder diesel engine from 1990 to 1998.

Featuring an interference-style extractor design, WILD723 replaces the restrictive factory exhaust manifold and is designed to improve exhaust gas flow and scavenging. The larger, smoother-flowing pipework helps improve low and mid-range torque, throttle response and overall engine performance, particularly useful in a heavy 4WD such as the LandCruiser.

Key Features

• Designed for Toyota LandCruiser HZJ80 80 Series
• Suits 4.2L 1HZ naturally aspirated diesel engine
• Interference-style extractor design for improved exhaust scavenging and torque
• 1.50" primary pipes
• 2.00" secondary pipes
• 2.50" outlet
• Supplied with base pipe incorporating a flexible exhaust bellow
• 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 designed for long service life
• Heat-resistant painted finish rated to approximately 600°C
• Precision mounting flanges for reliable sealing

Vehicle Fitment

• Make: Toyota
• Model: LandCruiser 80 Series
• Chassis: HZJ80 / HZJ80R
• Engine: 1HZ
• Capacity: 4.2L / 4164cc
• Configuration: Inline six-cylinder naturally aspirated diesel
• Year: 1990–1998

Fitment Notes

• Designed as a direct-fit header assembly for the applicable HZJ80 1HZ application
• Supplied with flexible-bellow base pipe for connection to the exhaust system
• Manifold/header gasket available separately – see DSF082
• Please confirm your vehicle is fitted with the 1HZ naturally aspirated diesel engine before ordering

What’s Included

• Wildcat WILD723 header / extractor assembly
• Base pipe with flexible exhaust bellow

Recommended With

• DSF082 exhaust manifold/header gasket
• Quality exhaust flange gasket where required
• Replacement manifold studs and nuts where original hardware is worn or corroded
• Free-flowing 2.50" exhaust system where increased exhaust flow is required

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 4.2L 1HZ diesel draws in approximately 8,328 litres of intake air per minute and expels around 25,000 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. Trial-fit the complete header and base-pipe assembly before fully tightening the fasteners. Inspect the existing exhaust mounts and connections during installation and replace worn components where necessary.

Warranty & Compliance

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

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

FAQ

What LandCruiser does WILD723 suit?
WILD723 is designed for the Toyota LandCruiser HZJ80 80 Series fitted with the 4.2L 1HZ naturally aspirated diesel engine from 1990 to 1998.

Does WILD723 suit the turbo-diesel LandCruiser?
No. WILD723 is listed for the naturally aspirated 1HZ engine. It should not be confused with the turbo-diesel 1HD-T or 1HD-FT engines used in other 80 Series models.

What size is the header outlet?
WILD723 headers have 1.50" primary pipes, 2.00" secondary pipes with a 2.50" outlet.

Does it include the base pipe?
Yes. WILD723 is supplied with a base pipe incorporating a flexible exhaust bellow.

What manifold gasket does it use?
The recommended exhaust manifold/header gasket is DSF082, available separately.

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.

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