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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
COBB Tuning Performance Parts deliver proven power gains with factory-like drivability backed by an "Engineered Performance" approach trusted by enthusiasts, pro tuners, and performance shops worldwide. Founded in 1999 and now headquartered in Austin, Texas, COBB designs, engineers, tests, and supports its products in-house to ensure reliable results across today's most popular performance platforms. Shop the full lineup of COBB Tuning performance parts at Black Ops Auto Works, including ECU tuning solutions, bolt-on upgrades, and staged power packages built to work together for predictable, repeatable performance. COBB ECU Tuning & Accessport The COBB Accessport is one of the most trusted ECU tuning devices in the industry. It enables safe ECU flashing, live data monitoring, diagnostics (read/clear codes), and tuning management helping drivers unlock stronger throttle response, improved drivability, and dependable horsepower and torque gains when paired with the right supportin...
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Shop Fabrication Parts & Materials at Black Ops Auto Works for stainless steel tubing, titanium tubing, aluminum charge piping, mandrel bends, V-band clamps, flanges, merge collectors, AN fittings, PTFE hose kits, braided fuel and oil lines, heat shields, welding supplies, brackets, bungs, and hardware for building custom exhaust systems, turbo plumbing, intercooler piping, fuel systems, and engine bay routing. Start with tubing (304 or 321 stainless, titanium, or aluminum) in the right diameter and wall thickness, then add mandrel bends, flanges, V-bands, and clamps to complete the joint work. AN plumbing follows the same pattern: match dash size to horsepower target, pair the right hose (PTFE or CPE) with matching hose ends, and use adapters, bulkheads, and distribution blocks to route fuel, oil, and coolant cleanly. Shop by material (stainless, titanium, aluminum), fitting type (AN, ORB, NPT), diameter, or brand (Vibrant, Ticon, Stainless Bros, Radium, Fragola, DEI, ATP). ...
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