Process West Intake Manifold Street Version Black Subaru WRX 2002-2005 | PWIM004B

Product Fitment:

2002-2005 Subaru WRX

For the 2002–05 WRX owner seeking maximum induction performance without sacrificing daily drivability, the Process West Street Billet Intake Manifold represents a true no-compromise solution.

This is the result of extensive development work, multiple prototype revisions, and a clean-sheet engineering approach that has positioned it as one of the most respected billet intake manifolds in the Subaru performance space.

Built Without Compromise

Every component is CNC machined from solid billet aluminium, ensuring strength, precision, and consistency that cast or fabricated alternatives cannot replicate.

Key construction features include:

• Generous bell-mouth runner entries for improved airflow efficiency
• Thick-wall polished mandrel-bent tube sections
• High-quality TIG welded assembly throughout

The result is a manifold engineered to withstand up to 100psi of boost pressure, delivering exceptional structural integrity for high-performance applications.

Street-Focused Performance

The Street configuration is designed to maintain strong low and mid-range torque, while still supporting healthy top-end power gains.

• Optimized plenum volume and runner length for street responsiveness
• Maintains compatibility with factory air conditioning systems
• Suitable for daily-driven performance builds

This balance makes it ideal for enthusiasts who want performance gains without compromising comfort or usability.

Proven Performance Gains

Testing across multiple setups has demonstrated consistent improvements:

• Approximately 9% increase in torque and horsepower on stock engine, turbo, and fuel system configurations
• Similar gains observed on highly modified setups, including E85 applications

This consistency across build levels highlights the manifold’s efficiency and airflow improvement regardless of supporting modifications.