Toyota FJ Cruiser GSJ15R 2011-2016 4.0L V6 1GR-FE Wildcat Exhaust Headers WILD726

Wildcat WILD726 exhaust headers (extractors) are designed for Toyota FJ Cruiser GSJ15R models from 03/2011 to 12/2016 fitted with the 4.0L V6 1GR-FE DOHC Dual VVT-i petrol engine.

Featuring a tuned 3-into-1 design with 42mm (1 5/8") primary pipes and 57mm (2.25") outlets, WILD726 replaces the restrictive factory exhaust manifolds and is designed to improve exhaust gas flow and scavenging for better torque, throttle response and usable engine performance.

Manufactured in Australia from mandrel-bent mild steel, WILD726 suits the Australian-delivered 5-speed automatic 4WD and is designed to retain air conditioning and power steering. Provision is incorporated for the required oxygen sensors.

Important: These headers are not a simple bolt-on installation. The factory catalytic converters must be cut and relocated, requiring welding and exhaust fabrication.

Please check availability and current lead time before ordering.

Key Features

• Designed for Toyota FJ Cruiser GSJ15R 03/2011–12/2016
• Suits the 4.0L V6 1GR-FE DOHC Dual VVT-i petrol engine
• Tuned 3-into-1 header design
• 42mm (1 5/8") primary pipes
• 57mm (2.25") outlets
• Mandrel-bent mild steel construction
• Suits the factory 5-speed automatic transmission
• Designed to retain air conditioning and power steering
• Provision for oxygen sensors
• Designed to improve exhaust flow and scavenging
• Helps improve torque, throttle response and engine performance
• Australian-made Wildcat performance headers

Construction

• Quality mild steel construction
• Mandrel-bent pipework for smooth exhaust gas flow
• Strong welded construction for durability
• Heat-resistant painted finish rated to approximately 600°C
• Australian manufactured by Wildcat

Additional Options

• Replacement exhaust manifold/header gaskets where required
• Replacement manifold studs and nuts where existing hardware is worn or corroded
• Suitable catalytic converters for the completed installation
• Performance exhaust system where further exhaust flow improvement is required
• Professional fitting service available from Best Mufflers

Vehicle Fitment

• Make: Toyota
• Model: FJ Cruiser
• Series: GSJ15R
• Date Range: 03/2011–12/2016
• Engine: 1GR-FE
• Capacity: 4.0L / 3956cc
• Configuration: V6 DOHC 24-valve Dual VVT-i petrol
• Transmission: 5-speed automatic
• Drivetrain: 4WD

Fitment Notes

• Designed for Australian-delivered Toyota FJ Cruiser GSJ15R models from 03/2011 to 12/2016
• Vehicle must be fitted with the 4.0L V6 1GR-FE Dual VVT-i petrol engine
• Designed for the Australian 5-speed automatic application
• Designed to retain air conditioning and power steering
• Specifications of overseas-market FJ Cruiser models may differ; please contact us before ordering for vehicles originally sold outside Australia
• Engine conversions, replacement engines or previously modified exhaust systems may affect fitment
• Please check availability and current lead time before ordering.

What’s Included

• 1 x Left-hand Wildcat WILD726 header assembly
• 1 x Right-hand Wildcat WILD726 header assembly
• Outlet/flange components as supplied with the header kit

Note: Exhaust manifold/header gaskets are not included unless specifically stated or selected separately at the time of purchase.

Recommended With

• New exhaust manifold/header gaskets where required
• Replacement manifold studs and nuts where existing hardware is worn or corroded
• Suitable catalytic converters for the completed installation
• Quality performance exhaust system where further exhaust flow improvement is required

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 4.0L 1GR-FE V6 theoretically draws in approximately 8,000 litres of intake air per minute and can expel around 24,000 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

• These headers are not a simple bolt-on installation
• The factory catalytic converters must be cut and relocated
• Welding and exhaust fabrication are required
• Relocating the catalytic converters may cause the check-engine light to illuminate
• An ECU calibration / computer edit may be required after installation
• Professional installation by an experienced exhaust workshop is strongly recommended
• Allow approximately 4 hours fitting time as a general guide
• Apply penetrating lubricant such as WD-40 or similar to exhaust studs, nuts and threaded fittings before removal
• Inspect the cylinder-head sealing surfaces, manifold studs and threads before installation
• Trial-fit both headers and check clearances before completing catalytic converter and exhaust modifications
• Ensure all oxygen sensors are correctly positioned and connected after installation
• Protect the painted header surfaces during trial fitting and installation
• Check all exhaust connections for leaks after installation
• Inspect and re-tighten the header mounting hardware after the initial heat cycles

Warranty & Compliance

Wildcat headers are covered by the applicable 2-year manufacturer's warranty subject to standard warranty terms and conditions.

Installation must retain the catalytic converters, oxygen sensors and any other 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

Will WILD726 fit Australian Toyota FJ Cruiser models?
Yes. WILD726 is designed for Australian-delivered Toyota FJ Cruiser GSJ15R models from 03/2011 to 12/2016 fitted with the 4.0L V6 1GR-FE Dual VVT-i petrol engine.

Will WILD726 fit a manual FJ Cruiser?
Australian-delivered FJ Cruiser GSJ15R models were fitted with a 5-speed automatic transmission. If you have an overseas-market manual FJ Cruiser, please contact us before ordering to confirm compatibility.

What size are the WILD726 header pipes?
WILD726 uses 42mm (1 5/8") primary pipes with 57mm (2.25") outlets.

Are WILD726 headers mandrel bent?
Yes. WILD726 uses mandrel-bent mild steel pipework.

Do the catalytic converters need to be modified?
Yes. Installation requires the factory catalytic converters to be cut and relocated, with welding and exhaust fabrication required.

Will the check-engine light come on?
Relocating the catalytic converters may cause the check-engine light to illuminate. ECU calibration or other appropriate corrective work may be required after installation.

Are WILD726 headers a direct bolt-on installation?
No. Cutting, welding and catalytic converter relocation are required, so professional installation by an experienced exhaust workshop is recommended.

Are exhaust manifold gaskets included?
Exhaust manifold/header gaskets are not included unless specifically stated or selected separately at the time of purchase.

What finish is used on WILD726?
The headers have a heat-resistant painted finish rated to approximately 600°C.

Are WILD726 headers Australian made?
Yes. Wildcat WILD726 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