SUB000FSYS / SUB000FSFF - COBB Fuel Rail and Fuel Line Installation Instructions
2008 - 2021 Subaru STI
Congratulations on your purchase of the COBB Tuning fuel rails and fuel lines package! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.
Assemble the provided ID1050x injectors, injector spacers (0.625", larger sized version for the ID1050x injectors), injector pigtails, socket head bolts, and o-rings onto the fuel rails.
Gently place the assembled driver and passenger side fuel rails on the motor. Once oriented, you'll give a gentle push to fully seat the injectors.
With your rails seated, it's now time to install the fuel lines. Each line is labeled according to it's position in the fuel line system. The line label is on the side which connects to the fuel rail. If you are connecting to the ethanol sensor and using Line 6, you will require https://www.cobbtuning.com/products/fuel-system/subaru-fuel-rail-line-kit-to-flex-fuel-sti-2008-2019/. Line 6 is not included in the standard Rail/Line package. Please verify you have that line, if needed, prior to beginning installation.
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COBB Product Install Instructions for Subaru Vehicles
Main Installation Instruction Repository for Subaru Parts
Calibration Map Notes for Subaru Vehicles
Link to Subaru Map Notes to see what map you should be on given the parts you've added