Cobb Fuel Rails Line Kit Package Subaru STI 2008-2021 | SUB000FRLK

Specifications   Part Details: The COBB Fuel Rails & Fuel Line Kit Package is designed to improve fuel delivery consistency and support higher-demand setups on Subaru STI models from 2008–2021. By replacing restrictive factory fuel rails and lines, this kit helps ensure balanced fuel distribution across all cylinders—an essential foundation for performance tuning and ethanol-based fuel systems. Precision-engineered for direct fitment, the system features high-quality fuel rails and upgraded fuel lines capable of handling increased flow and fuel pressure. This makes it an ideal upgrade for vehicles running flex fuel, upgraded injectors, or higher horsepower calibrations where consistent fueling is critical for safe and repeatable performance. Fueling Stability for High-Performance Builds Uneven fuel distribution can become a limiting factor as power levels increase. The COBB fuel rail and line package addresses this by improving cylinder-to-cylinder fuel balance, helping maintain stable air-fuel ratios under load. This is especially important for STI builds targeting increased boost, ethanol blends, or aggressive tuning strategies. Compatibility & Integration This kit is engineered to integrate seamlessly with other COBB fuel system components, including upgraded injectors and flex fuel setups. Installation maintains OEM-level fit and finish while providing the headroom required for future power upgrades. Key Features Direct-fit fuel rail and fuel line upgrade for Subaru STI 2008–2021 Improved fuel flow and cylinder-to-cylinder fuel distribution Designed to support ethanol blends and high-performance tuning High-quality fuel rails, fittings, and lines for durability under increased fuel pressure Compatible with COBB fuel system components and Accessport-based tuning Ideal foundation for flex fuel and upgraded injector setups What’s Included COBB fuel rails Upgraded fuel lines Required fittings and installation hardware Frequently Asked Questions Is this fuel rail kit required for flex fuel? While not always mandatory, upgraded fuel rails and lines are strongly recommended for flex fuel and higher horsepower setups to maintain consistent fuel delivery and safe operation. Does this kit support upgraded injectors? Yes. This package is designed to work with upgraded injectors and is commonly paired with higher-flow injector setups on performance STI builds. Is tuning required after installation? Yes. Any fueling system upgrade should be followed by proper ECU tuning to ensure correct fuel calibration. Recommended Supporting Fuel Components Fuel Injectors – higher ethanol content often requires increased fuel flow to maintain proper air-fuel ratios. Fuel Pumps – support the additional fuel volume needed for ethanol and higher power levels. Fuel Pressure Regulators – help maintain consistent fuel pressure across varying ethanol blends. Fuel Delivery Components – explore supporting fuel system parts designed to work together. Learn more about COBB Tuning performance solutions and supporting components Shipping   Shipping Options: WrenchMastersAuto.com ships your performance parts safely, quickly and conveniently nationwide via the most trusted shipping carriers such as: UPS, Fed Ex, USPS, and DHL.          Delivery Times: In Stock: 3-7 Business Days Custom Orders: 2-6 Weeks, Please Email: [email protected] or Call: 727-565-9808 for Questions. Enjoy FREE SHIPPING on most orders over $199! Contact WrenchMasters   Have Questions? Need Assistance? 727-565-9808 Our expert team members are available Mon-Friday 8:00 AM to 5:30 PM EST to provide support and answer any questions or concerns before or after your parts purchase. Part Installation Want your performance parts professionally installed? Save time, stress & hassle by scheduling your auto appointment online below. Our team of ASE certified master techs will make sure your parts are installed properly at our St.Petersburg, Florida shop location. Schedule Install Now Performance Parts Locator Looking for a specific part not listed on our online store? WrenchMastersAuto.com has access to over 40,000 aftermarket performance parts for vehicles of all makes and models, old and new.  Fill out the parts request form below, and our parts specialist will contact you within 24-48 hours.