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SKU: B312150 | UPC: 700424675418
COBB 1050x Top-Top-Feed Fuel Injectors (Set of 4) – Subaru WRX/STI/FXT/LGT (All EJ & FA20 2002-2021)
The COBB 312150 1050x set delivers 1050 cc/min flow at 43.5 psi for Subaru EJ20/EJ25 (WRX, STI, Forester XT, Legacy GT) and FA20DIT (2015-2021 WRX) engines. These injectors provide precise atomization and linearity up to 95% duty cycle, powering 500-600+ whp on E85 or 650+ whp on race gas. Direct plug-and-play installation uses the factory harness with full Accessport calibration data included.
Key Features
- 1050 cc/min @ 43.5 psi: True measured flow rate (1100 lb/hr equivalent) for reliable high-horsepower fueling.
- Smooth Idle & Part-Throttle: Maintains consistent performance without stumbling, even on E85 blends.
- Plug-and-Play Fit: Top-feed design with 11 mm bore and USCAR connector matches Subaru factory setup—no adapters required.
- Full Data Included: Characterization sheets enable seamless Accessport off-the-shelf or custom tuning.
- Made in USA: Flow-matched set with lifetime warranty against defects.
Product Notes
- Fits all top-feed EJ20/EJ25 and FA20DIT Subarus—no modifications needed.
- Replace o-rings with new ones and use assembly lube for leak-free operation.
- Fully insured shipping in official COBB box with foam protection.
Installation Notes
- Professional installation recommended.
- 30-minute DIY: Remove fuel rail, swap injectors, reinstall with new o-rings.
- Requires Accessport with 1050x map for tuning—OTS maps available from COBB.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2021 | Subaru | Impreza | WRX |
| 2004-2021 | Subaru | Impreza | STI |
| 2015-2021 | Subaru | WRX | Base / Premium |
| 2004-2013 | Subaru | Forester | XT |
| 2005-2009 | Subaru | Legacy | GT |
| 2005-2009 | Subaru | Outback | XT |
Why Choose COBB?
- Proven reliability in Subaru tuning community for over 10 years.
- Every set individually flow-tested and data-logged in the USA.
- Powers all COBB Protune record holders from 600-1000+ whp.
Frequently Asked Questions
-
Q: Will these fit my 2018 STI?
A: Yes, direct drop-in for all EJ25 top-feed and FA20DIT WRX/STI models 2002-2021. -
Q: Do I need a tune?
A: Yes, pair with COBB Accessport—free 1050x off-the-shelf maps provided. -
Q: What about warranty?
A: Lifetime against defects, backed by US manufacturing and rigorous testing.
Shipping & Handling
- Method: UPS/FedEx Ground – fully insured
- Availability: In stock - ships same or next business day
- Packaging: Official COBB box with foam inserts (9 x 7 x 3 inches)
- Weight: 1.65 lbs
Read More
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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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