Holden Jackaroo Isuzu 3.5L V6 6VE1 Headers – Wildcat WILD289

Wildcat WILD289 exhaust headers (extractors) are designed for selected Holden Jackaroo and Isuzu models fitted with the 3.5L V6 6VE1 petrol engine from 1998 to 2007.

Featuring a tuned-length design, WILD289 replaces the restrictive factory exhaust manifolds with larger, smoother-flowing pipework designed to improve exhaust gas flow and scavenging. This helps reduce restriction and improve torque, throttle response and overall engine performance, making these headers suitable for street, touring and 4WD applications.

Key Features

• Designed for selected Holden Jackaroo and Isuzu 3.5L V6 applications
• Suits the 6VE1 DOHC V6 petrol engine
• Tuned-length design for street performance
• 1.75" primary pipes
• 2.25" outlets
• No separate secondary pipe size specified for this design
• 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 flanges for reliable sealing

Additional Options

• RBG267: Replacement exhaust manifold/header gasket set available separately
• Base pipe / exhaust connection required separately

Vehicle Fitment

• Make: Holden / Isuzu
• Model: Jackaroo / applicable Isuzu models
• Engine: 6VE1 DOHC V6 petrol
• Capacity: 3.5L / 3494cc
• Year: 1998–2007

Fitment Notes

• Designed for applicable vehicles fitted with the 3.5L 6VE1 V6 petrol engine
• Base pipe is not included
• Check the existing exhaust connection and base pipe requirements before installation
• Left-hand-drive fitment has not been confirmed – clearance between the left-side header and steering shaft must be checked before ordering for an LHD vehicle
• Please confirm engine code and existing exhaust layout before ordering

What’s Included

• Wildcat WILD289 header / extractor assemblies
• Base pipe not included

Recommended With

• RBG267 exhaust manifold/header gasket set
• Matching base pipe / exhaust connection
• Replacement exhaust flange gaskets where required
• Replacement manifold studs and nuts where existing hardware is worn or corroded
• Free-flowing exhaust system for further reduction in exhaust restriction

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 3.5L 6VE1 V6 draws in approximately 6,988 litres of intake air per minute and expels around 21,000 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 both headers and the required base pipe/exhaust connections before fully tightening the system. Protect the painted surfaces during installation to minimise scratching or damage.

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 the catalytic converters, oxygen sensors and any other emissions-control equipment required for the vehicle and comply with the regulations applicable in your state or territory.

FAQ

What vehicles does WILD289 suit?
WILD289 is designed for selected Holden Jackaroo and Isuzu models fitted with the 3.5L V6 6VE1 petrol engine from 1998 to 2007. Please confirm the engine code and exhaust layout before ordering.

Are WILD289 headers a direct-fit replacement?
The headers are designed for the applicable 6VE1 engine and vehicle application; however, the base pipe is not included. The existing exhaust layout and required base pipe connection should be checked before installation.

What size are the header pipes?
WILD289 uses 1.75" primary pipes and 2.25" outlets. No separate secondary pipe size is specified for this design.

What gaskets are required?
The recommended exhaust manifold/header gasket set is RBG267, available separately.

Will WILD289 fit a left-hand-drive Isuzu?
Left-hand-drive fitment has not been confirmed. The main concern is possible clearance between the left-side header and steering shaft. We recommend checking this clearance before ordering for an LHD vehicle.

Is the base pipe included?
No. The base pipe is not included with WILD289 and must be sourced or fabricated separately as required for the vehicle.

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