Top Feed 1050X Fuel Injectors

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.