Mitsubishi Sigma Scorpion GE-GN 1977-1987 2.0L 4G52 2.6L 4G54 Wildcat Exhaust Headers WILD098

Wildcat WILD098 headers (extractors) are designed for applicable Mitsubishi Sigma and Scorpion GE-GN rear-wheel-drive models fitted with the 2.0L 4G52 or 2.6L 4G54 SOHC 8-valve Astron petrol engine.

Featuring a Tri-Y header design, WILD098 provides a performance replacement for the original exhaust manifold and is designed to improve exhaust flow, torque, throttle response and engine performance.

The Wildcat application catalogue specifies approximately 41mm (1⅝") primary pipes, 44mm (1¾") secondary pipes and a 57mm (2¼") slip outlet.

Australian Made.

Please check availability and current lead time before ordering.

Key Features

• Suits applicable Mitsubishi Sigma and Scorpion models
• Wildcat catalogue application: 1977-1987
• GE-GN series application
• Suits 2.0L 4G52 SOHC 8-valve Astron petrol engine
• Suits 2.6L 4G54 SOHC 8-valve Astron petrol engine
• Rear-wheel-drive application
• Tri-Y header design
• Approximately 41mm (1⅝") primary pipes
• Approximately 44mm (1¾") secondary pipes
• Approximately 57mm (2¼") slip outlet
• Suits manual transmission models
• Suits automatic transmission models
• Suits applicable vehicles with air-conditioning
• Suits applicable vehicles with power steering
• Oxygen-sensor provision listed by Wildcat
• Australian Made

Construction

Wildcat WILD098 headers are Australian Made and use a Tri-Y configuration designed around the Mitsubishi Astron 4G52 and 4G54 rear-wheel-drive engine applications.

The header configuration uses approximately 41mm (1⅝") primary pipes feeding into 44mm (1¾") secondary pipes with a 57mm (2¼") slip outlet.

Additional Options

A replacement header/manifold gasket is available separately – see RBG056S.

Please contact Best Mufflers if you require advice on fitment or the exhaust components required to complete the installation.

Vehicle Fitment

• Make: Mitsubishi / Chrysler Mitsubishi
• Model: Sigma / Scorpion
• Series: GE / GH / GJ / GK / GL / GN as applicable
• Catalogue Year Range: 1977-1987
• Engines: 4G52 / 4G54
• Capacity: 2.0L / 2.6L
• Configuration: SOHC 8-valve inline four-cylinder petrol
• Engine Family: Mitsubishi Astron
• Drive: Rear-wheel drive
• Transmission: Manual / Automatic

IMPORTANT: The 1977-1987 catalogue range covers multiple Sigma and Scorpion variants. WILD098 is specifically for the applicable 2.0L 4G52 and 2.6L 4G54 Astron engine applications. Confirm the engine before ordering.

Header Specifications

• Design: Tri-Y
• Primary Pipe: Approximately 41mm (1⅝")
• Secondary Pipe: Approximately 44mm (1¾")
• Outlet: Approximately 57mm (2¼")
• Outlet Type: Slip
• Manual Transmission: Yes
• Automatic Transmission: Yes
• Air-Conditioning: Yes
• Power Steering: Yes
• Oxygen Sensor: Provision listed
• Replacement Gasket: RBG056S

Fitment Notes

4G52 & 4G54: WILD098 suits the applicable 2.0L 4G52 and 2.6L 4G54 SOHC 8-valve Astron petrol engines. It should not be ordered solely by the vehicle year because Sigma models were sold with several different engine families and capacities.

Rear-Wheel Drive: This application is for the longitudinal rear-wheel-drive 4G52/4G54 engine configuration used in the Sigma and Scorpion.

Transmission: The Wildcat catalogue lists WILD098 for both manual and automatic transmission applications.

Accessories: The Wildcat catalogue lists compatibility with air-conditioning and power steering.

Outlet: WILD098 has a 57mm (2¼") slip outlet. The downstream exhaust connection should be checked during installation and fabrication or adaptation may be required depending on the existing exhaust system.

Because these vehicles are now approximately 40-50 years old, engine conversions and modified exhaust systems are common. Confirm the engine code, cylinder head and existing exhaust configuration before ordering.

What's Included

• 1 x Wildcat WILD098 header/extractor assembly

Gaskets, bolts and other installation components should not be assumed to be included unless specifically confirmed before ordering.

Recommended With

RBG056S – replacement header/manifold gasket.

Before installation, inspect the existing exhaust system, engine mounts, manifold studs and associated mounting hardware.

Why Good Headers & Exhaust Systems Matter

At 4,000 rpm, the 2.0L 4G52 engine theoretically draws approximately 4,000 litres of intake air per minute at 100% volumetric efficiency and expels around 12,000 litres of hot exhaust gas per minute at approximately 600°C.

At the same engine speed, the 2.6L 4G54 engine theoretically draws approximately 5,200 litres of intake air per minute and expels around 15,600 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

Before installation, confirm that the vehicle is fitted with the applicable 2.0L 4G52 or 2.6L 4G54 SOHC 8-valve Astron engine.

Because WILD098 uses a 57mm (2¼") slip outlet, check the existing downstream exhaust diameter and configuration before installation. Exhaust adaptation may be required depending on the vehicle's current exhaust system.

Lubricate threaded fasteners with WD-40 or a similar penetrating lubricant before removal to assist with easier removal and installation.

Professional installation is recommended. After installation and several heat cycles, inspect the exhaust system for leaks and recheck accessible fasteners where appropriate.

Warranty & Compliance

Any emissions-control equipment required for the particular vehicle must remain correctly installed and operational.

Installation must comply with applicable Australian state or territory requirements relating to emissions, exhaust noise and vehicle modifications.

FAQ

What vehicles do Wildcat WILD098 headers fit?
For this application, WILD098 is catalogued for applicable Mitsubishi Sigma and Scorpion GE-GN models fitted with the 2.0L 4G52 or 2.6L 4G54 Astron petrol engine.

Does WILD098 fit both the 2.0L and 2.6L engines?
Yes. The Wildcat catalogue lists the Sigma-Scorpion application as 2.0L-2.6L. The corresponding engines are the 2.0L 4G52 and 2.6L 4G54 SOHC 8-valve Astron engines.

Does WILD098 fit every 1977-1987 Mitsubishi Sigma?
No. Sigma models were produced with several different engines. Confirm that the vehicle has the applicable 4G52 or 4G54 Astron engine before ordering.

Does WILD098 fit manual and automatic models?
Yes. The Wildcat catalogue lists WILD098 for both manual and automatic transmissions.

Does WILD098 fit vehicles with air-conditioning and power steering?
Yes. The Wildcat application information lists compatibility with air-conditioning and power steering.

What size are WILD098 headers?
The Wildcat catalogue specifies approximately 41mm (1⅝") primary pipes, 44mm (1¾") secondary pipes and a 57mm (2¼") slip outlet.

What gasket suits WILD098?
The listed replacement gasket is RBG056S.

Is WILD098 also used on the Mitsubishi Pajero?
Yes. WILD098 is also catalogued for the Mitsubishi Pajero NE-NG 2.6L 4G54 4WD. Installation requirements differ between the Pajero and Sigma/Scorpion applications, so follow the fitment information for the specific 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.

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.

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