Process West Intake Manifold Reverse Orientation (Bosch DBW 74mm Throttle) - Subaru WRX / STI - EJ20 / EJ25

The Process West Intake Manifold in reverse orientation is built for EJ20 and EJ25 Subaru WRX and STI engines running a Bosch drive-by-wire 74mm throttle body, which is not included. It combines a billet plenum and billet bell mouths with thick-wall polished CNC-bent tubing, TIG welded and rated for boosted use up to 100 psi. The plenum and runner design improves low and mid-range torque while keeping top-end power, with Process West reporting gains of 10% or more on a stock engine. The reverse throttle position suits setups where the standard layout does not work, custom throttle flanges are available on request, and a Track version with shorter billet TGVs is recommended for performance builds without air conditioning.

Features

• Billet plenum and billet bell mouths
• Thick-wall polished CNC-bent tubing with TIG welding
• Rated for boosted use up to 100 psi
• Reverse throttle body orientation
• Suits the Bosch drive-by-wire 74mm throttle body (not included)
• Part of a modular range covering MY99 GC8 through current WRX and STI models
• Custom throttle flanges available on request
• Available in Silver or Black

Specifications

• Brand: Process West
• Product Type: Intake Manifold
• Construction: Billet plenum and bell mouths, thick-wall polished CNC-bent tubing, TIG welded
• Boost Rating: Up to 100 psi
• Throttle Body: Bosch drive-by-wire 74mm (not included)
• Orientation: Reverse throttle body
• Engine: Subaru EJ20 / EJ25
• Colour Options: Silver and Black
• Part Numbers: PWIM008 (Silver), PWIM008B (Black)

Vehicle Compatibility: 2 applications across 1 make. Select a make to view.

Please confirm fitment against your vehicle before ordering. Contact us if you need help selecting the right part.