SKU: B315200 | UPC: 700424673650
COBB Adjustable Fuel Pressure Regulator Kit – 2008-2021 Subaru STI & 2008-2014 WRX
The COBB 315200 replaces the factory regulator with a billet aluminum Aeromotive unit on 2008-2021 Subaru STI (EJ257) and 2008-2014 WRX (EJ255) for precise fuel delivery. Adjust base pressure from 30-70 psi with true 1:1 manifold reference to eliminate droop under boost, supporting E85, flex fuel, large injectors, and upgraded pumps. Kit includes firewall bracket, braided stainless line, and all fittings for direct bolt-on installation.
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.
- Made in the USA: Aeromotive regulator and COBB components backed by lifetime warranty against defects.
Product Notes
- Fits all 2008-2021 STI (EJ257) and 2008-2014 WRX (EJ255) with stock or aftermarket fuel rails and pumps.
- Accessport tuning required after pressure adjustments to match fuel maps.
- In stock – ships same or next business day via UPS/FedEx Ground.
Installation Notes
- Professional installation recommended.
- 45-60 minute install: Mount firewall bracket, route braided line, replace factory regulator.
- Full color instructions and all hardware included; compatible with stock lines.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2021 | Subaru | WRX STI | Base |
| 2008-2021 | Subaru | WRX STI | Limited |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2008-2014 | Subaru | Impreza WRX STI | Base |
| 2011-2014 | Subaru | Impreza WRX STI | Limited |
| 2010 | Subaru | Impreza WRX STI | Special Edition |
| 2008-2014 | Subaru | Impreza WRX | Base |
Why Choose COBB Tuning?
- #1 selling adjustable FPR for EJ25 Subaru models over 20 years.
- Engineered and manufactured in the USA for direct fitment.
- Proven on 600-1000+ hp EJ builds worldwide with Aeromotive integration.
Frequently Asked Questions
- Q: Will this work on 2015+ WRX FA20?
A: No, use COBB 315250 kit for FA20 WRX STI; this is EJ25-specific. - Q: What materials are used in construction?
A: Billet 6061 aluminum bracket (black anodized), Aeromotive regulator body, and PTFE-lined braided stainless steel line. - Q: What warranty and tuning is needed?
A: Lifetime against defects; Accessport tuning required post-install for pressure changes.
Shipping & Handling
- Method: UPS/FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Official COBB retail box, 10″ x 8″ x 4″
- Weight: 1.9 lbs
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