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Air and Fuel› Fuel Injection Systems and Components - Electronic

COBB Tuning

Top Feed 1050X Fuel Injectors

$642.00 $622.77 Save $19.23

SKU: COBB312150

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The COBB Tuning Top Feed 1050X Fuel Injectors are designed for high-power EJ257 builds in the Subaru STI. These injectors offer a 1050cc/min flow capacity, significantly exceeding the flow of factory STI injectors. They feature a top-feed design for direct replacement of stock top-feed injectors and include characterized injector data for ProTuner use with Accesstuner software.
Show original supplier description
The COBB Tuning Top Feed 1050X Fuel Injectors are a performance upgrade designed to meet the fueling demands of high-power EJ257 builds in 2007-2021 Subaru WRX STI models. This set of four injectors provides a substantial flow rate of 1050cc/min, offering considerably more capacity than stock STI injectors. This increased flow is critical for maintaining consistent fuel delivery and preventing lean conditions as engine power levels rise. These injectors feature a top-feed design, ensuring direct replacement compatibility with the factory top-feed fuel rails. A key benefit of the 1050X injectors is their characterized data, which meticulously details each injector's flow rates and spray patterns. This information is vital for ProTuning professionals, as it allows them to develop a custom calibration utilizing Cobb's Accesstuner software for precise engine management. Utilizing this characterized data enables ProTuners to create accurate and safe fuel tables, essential for maximizing performance and reliability. It is crucial to note that these larger injectors necessitate a custom ProTuner calibration. Failure to use a custom tune can lead to inconsistent fueling and potential engine damage. The set includes four injectors, along with necessary O-rings and installation hardware.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCOBB Tuning
Part NumberCOBB312150
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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