Professional Subaru Calibrations right at your fingertips. From custom OTS maps, to fully built cars. Certified Cobb Pro Tuner for Subaru Guide to selecting the right tune for you: -Stage 1: No major engine modifications -Stage 1+: Intake and other modifications while retaining the stock Downpipe / J-Pipe -Stage 2: Downpipe / J-Pipe and other modification's while retaining the stock fuel injection system, and the stock intake system (Fuel Pump Recommended for EJ's) -Stage 2+: Intake and Downpipe / J-Pipe with other modifications, while retaining the stock fuel injection system (Fuel Pump Required for EJ's) -Stage 3/3+: Intake and Downpipe / J-Pipe with other modifications, with fuel system upgrades. (Fuel Pump Required for EJ's) -NEXGEN Flex Fuel: Cobb NEXGEN for 08+ STI, 15-21 FA WRX and FB WRX. Select this option if you have any stage of modifications and are utilizing Flex Fuel. Reach out for dual-map tunes. Questions? No worries, head over to the Knowledge Base page or the Contact drop down and send us an email.