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
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