The COBB 08-21 Subaru STi Fuel Pressure Regulator Kit is designed for the verified vehicle applications listed below. Match manufacturer part number 315200, complete year, make, model, application, engine and transmission configuration, required calibration, emissions eligibility, interfaces, and every product note before ordering.

Key Features

• Aeromotive 13129 Regulator: True 1:1 rising rate maintains fuel pressure psi-for-psi with manifold pressure across 30-70 psi range for consistent fueling on high-power setups.
• CNC Billet Firewall Bracket: Black anodized 6061 aluminum ensures secure mounting with perfect OEM-like fitment on STI and WRX firewalls.
• Braided Stainless -6 AN Line: Pre-assembled PTFE-lined line with fittings delivers reliable flow without leaks or restrictions.
• Full 1:1 Manifold Reference: Prevents pressure drop during boost for stable AFRs on stock or aftermarket fuel systems.
• Accessport tuning required after pressure adjustments to match fuel maps.
• #1 selling adjustable FPR for EJ25 Subaru models over 20 years.

Fitment

Specifications

What’s Included

One new COBB product in the exact configuration and quantity identified by manufacturer part number 315200. Calibrations, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, tools, and companion components are included only when expressly stated for this exact part number.

About COBB

COBB develops engine-management, intake, cooling, exhaust, drivetrain, suspension, and vehicle-accessory products for supported performance platforms. Correct selection remains exact-vehicle, exact-configuration, exact-interface, and exact-part-number specific.

Related COBB Products

• Cobb 08-21 Subaru STI Fuel Pressure Regulator (for Fuel Rail Kit)
• Cobb Subaru 08-21 STI (Incl. 2018 Type RA) Fuel Pressure Sensor Kit
• COBB Subaru/Toyota In-Tank 4.5 Bar Fuel Pressure Regulator Kit

Browse the COBB collection for related tuning, intake, cooling, exhaust, drivetrain, and chassis products.

Frequently Asked Questions

Will this COBB product fit my 2008-2014 Subaru Impreza WRX STI?
That application is listed, but confirm the exact part number, engine and transmission configuration, factory equipment, required calibration, emissions eligibility, and every manufacturer note before ordering.

Are all supporting parts included?
Only components expressly listed for the exact manufacturer part number are included. Tuning, hardware, hoses, clamps, gaskets, adapters, wiring, fluids, and companion components may be separate.

Is tuning or calibration required after installation?
Requirements depend on the exact product and vehicle. Intake, fuel, boost, turbo, and engine-management changes may require a compatible calibration before operation.

Installation Instructions

Follow the current COBB and factory service instructions for this exact part number. Verify fitment, factory equipment, emissions eligibility, required calibration, software and firmware, interfaces, hardware, fluid or electrical connections, and clearances before installation. Inspect the completed work and confirm safe operation before full-load use.