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SKU: B315150 | UPC: 700424673643
COBB Fuel Pressure Regulator Manifold Reference Relocation Kit – Subaru WRX/STI/FXT/LGT 2002-2021
The COBB 315150 relocates the factory fuel pressure regulator from the fuel rail to a firewall-mounted bracket, converting to true 1:1 manifold reference with vacuum hose and fittings. This eliminates fuel pressure droop under boost on 2002–2021 WRX/STI, 2004–2013 Forester XT, 2005–2009 Legacy GT/Outback XT EJ20/EJ25 engines. It restores accurate injector scaling and cleans the engine bay for Flex Fuel, E85, or big-turbo setups.
Key Features
- True 1:1 Manifold Reference: Directly references manifold vacuum/boost to prevent pressure drop and lean conditions under high boost
- CNC Billet Aluminum Bracket: Firewall-mounted, black anodized 6061 aluminum for durable, clean installation
- Plug-and-Play Fittings: OEM quick-connects and braided -4 AN PTFE line ensure leak-free, easy connection without cutting lines
- Injector Scaling Accuracy: Maintains consistent fuel delivery, required for E85, Flex Fuel, and high-horsepower tunes
- Made in USA: Lifetime warranty with COBB engineering proven on 600–1000+ hp EJ/FA builds
Product Notes
- Fits all top-feed EJ20/EJ25 Subarus including factory or aftermarket FPR from COBB, Aeromotive, Turbosmart
- Compatible with Accessport tuning; update maps post-install for best results
- In stock and ships same/next business day in official COBB packaging
Installation Notes
- Professional installation recommended.
- 30–45 minute install using basic hand tools; route vacuum hose to manifold source
- No fuel line cutting required; uses OEM quick-connects and included hardware
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2004-2021 | Subaru | Impreza | WRX STI |
| 2004-2013 | Subaru | Forester | XT |
| 2005-2009 | Subaru | Legacy | GT |
| 2005-2009 | Subaru | Outback | XT |
| 2008-2014 | Subaru | Impreza | WRX STI |
| 2011-2014 | Subaru | Impreza | WRX STI Limited |
| 2010 | Subaru | Impreza | WRX STI Special Edition |
| 2015 | Subaru | WRX STI | Base |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2015-2021 | Subaru | WRX STI | Limited |
Why Choose COBB Tuning?
- #1 selling FPR kit for Subaru performance over 20 years
- Engineered and manufactured in USA with lifetime defect warranty
- Track-proven on global 600–1000+ hp EJ builds
Frequently Asked Questions
-
Q: Will this work on my 2018 STI?
A: Yes, fits every EJ20/EJ25 top-feed from 2002–2021 WRX/STI. -
Q: Do I need this for E85/Flex Fuel?
A: Yes, prevents lean spikes by eliminating boost-related fuel pressure droop. -
Q: Can I keep my factory FPR?
A: Yes, the kit relocates and references the OEM regulator directly.
Shipping & Handling
- Method: UPS/FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Official COBB retail box
- Weight: 0.95 lbs
COBB
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