EJ257 High-Volume Fuel Rails

The COBB Tuning Fuel Rails are engineered for performance-driven 2008-2021 Subaru WRX STI models equipped with the EJ257 engine. These upgraded fuel rails are crucial for high-flow builds that utilize larger turbochargers, higher boost pressures, and increased injector duty cycles. By increasing the internal volume beyond that of the factory rails, they effectively minimize fuel pressure drops, ensuring consistent delivery to each injector even under extreme demand. This enhanced fuel distribution is vital for maintaining optimal performance and preventing fuel starvation in modified engines. The larger volume provides more consistent pressure distribution between injectors, significantly reducing the variation that can occur with stock components when operating at high flow rates. The rails are constructed with an anodized black finish and feature a -6AN inlet size, suitable for top-feed injectors. All necessary hardware and fittings are included for a complete installation. COBB Tuning has a long-standing reputation for developing performance software and hardware for turbocharged enthusiast vehicles. The RallySport Take highlights that these fuel rails are essential for high-flow EJ257 builds, improving injector-to-injector consistency.