Intake Manifold – VB FA24 WRX

Process West FA24 Intake Manifold for MY22+ Subaru WRX

Upgrade the airflow and performance potential of your MY22+ Subaru WRX with the FA24 engine with the Process West FA24 Intake Manifold. Developed specifically for the VB WRX, this performance intake manifold combines a billet aluminium plenum, large-bore cast runners and an integrated, fully functional Tumble Generator Valve (TGV) section.

The design focuses on improving internal airflow, increasing plenum volume and providing greater runner capacity to support improved cylinder filling and engine performance.

High-Flow FA24 Intake Manifold Design

The Process West FA24 Intake Manifold uses precision computer-designed internal porting to optimise airflow throughout the manifold.

Key design elements include:

• Billet aluminium plenum

• Large-bore cast aluminium runners

• Increased plenum volume

• Increased runner capacity

• Precision computer-designed internal porting

• Fully integrated TGV section

• Improved airflow to the FA24 cylinder head

• Designed specifically for the MY22+ VB WRX

The combination of increased airflow capacity and optimised internal geometry is designed to reduce intake restrictions and support higher power output, particularly on modified and tuned FA24 engines.

Performance Gains on the FA24 WRX

Testing conducted by Process West demonstrated measurable performance gains after replacing the factory intake manifold.

The test vehicle was equipped with:

• Process West Stage 2 Front Mount Intercooler

• Process West Air Intake

• Invidia Turbo-Back Exhaust

• Blouch 5056 Bolt-On Turbo

• Factory intake manifold

• 98-octane fuel / US 93-octane equivalent

With the factory intake manifold installed, the vehicle produced 246kW (331hp) at the wheels on the test dyno.

After installing the Process West FA24 Intake Manifold and adjusting the tune while maintaining the same boost pressure, output increased to 275kW (368hp) at all four wheels.

This represents approximately a 12% increase in peak power, with improvements recorded across the rev range. Testing also showed approximately 10% additional torque through much of the 2,500rpm to 6,500rpm range.

Actual results will vary depending on the vehicle’s turbocharger, fuel system, calibration, exhaust, intercooler, intake and overall engine setup.

Integrated TGV Section

The FA24 factory intake manifold incorporates the TGV system into its one-piece design. Because of this configuration, developing a standalone performance intake manifold required the TGV system to be redesigned as part of the manifold.

The Process West intake manifold therefore features a fully integrated billet TGV section, complete with operational shafts and butterfly valves.

This allows the manifold to retain TGV functionality while providing the increased airflow capacity and revised internal design required for performance applications.

TGV Delete Option

For applications requiring a complete TGV delete, Process West offers components that allow the TGV shafts and butterfly valves to be removed while retaining the factory TGV motors and sensors.

This configuration is designed to prevent unnecessary Check Engine Lights while allowing the TGV hardware to be removed from the airflow path.

For the TGV delete conversion components, refer to Process West part number PWTD07.

Important: Manifolds supplied to the USA are supplied with the TGV shafts and butterflies installed. Customers wanting to convert to a TGV-delete configuration should obtain the appropriate components separately.

No Check Engine Light Design

The Process West FA24 Intake Manifold is part of the manufacturer’s NO CEL range, with the TGV system designed to maintain compatibility with the factory electronic controls when installed in its standard configuration.

This provides a performance-oriented manifold solution without requiring unnecessary changes to the factory TGV control system.

Front Mount Intercooler Compatibility

The Process West FA24 Intake Manifold is designed for use with a front mount intercooler (FMIC).

The manifold features a revised throttle body position that sits lower and closer to the firewall than the factory intake manifold. Because of this change, a factory top-mount intercooler configuration is not compatible.

The throttle body position also means that some aftermarket front mount intercooler kits may require an adaptor to achieve correct pipe alignment.

Process West Throttle Adaptor Pipe

Vehicles using the Process West FA24 Intake Manifold with the Process West Front Mount Intercooler Kit require the Process West Throttle Adaptor Pipe (PWIM010AP) to accommodate the revised throttle body position.

The adaptor pipe is also designed to provide greater installation flexibility when using alternative aftermarket front mount intercooler configurations, with multiple hose connection options available.

Important: Confirm intercooler and piping compatibility before ordering the intake manifold.

Port Injection Version – PWIM010PI

For high-performance and competition-focused FA24 builds, the Process West PWIM010PI Port Injection Intake Manifold adds four additional injector mounting points.

The port injection configuration provides additional fuel-system flexibility for tuned FA24 engines requiring greater fuelling capacity.

Key Features

• Designed for MY22+ Subaru WRX VB FA24

• High-flow performance intake manifold

• Billet aluminium plenum

• Large-bore cast runners

• Increased plenum volume

• Increased runner capacity

• Precision computer-designed internal porting

• Integrated functional TGV section

• Supports improved airflow and cylinder filling

• Proven dyno-tested performance gains

• Approximately 12% peak power improvement in the manufacturer’s test setup

• Approximately 10% additional torque through much of the tested rev range

• NO CEL design with standard TGV configuration

• Compatible with front mount intercooler systems

• Revised throttle body position for improved packaging with the performance manifold

• TGV delete components available separately

• Port Injection version available as PWIM010PI

Important Fitment Information

Before purchasing, confirm that your MY22+ VB WRX is equipped with a compatible front mount intercooler setup.

This intake manifold cannot be used with the factory top-mounted intercooler configuration due to the revised throttle body position.

If using a Process West Front Mount Intercooler Kit, the PWIM010AP Throttle Adaptor Pipe is required to correctly align the intercooler piping with the new throttle body location.

For other aftermarket front mount intercooler systems, verify piping clearance and connection compatibility before installation.

Performance Upgrade for the FA24 WRX

The Process West FA24 Intake Manifold is designed for WRX owners looking to improve airflow and increase the performance potential of a tuned FA24 engine. Its high-flow plenum, larger runners, optimised internal porting and integrated TGV system provide a comprehensive upgrade over the factory intake manifold.

When combined with appropriate supporting modifications and ECU tuning, the manifold can help deliver increased power, improved torque delivery and greater airflow capacity across the engine’s operating range.