*Ford Focus ST/Fiesta ST/EB Mustang/Maverick Fuel Upgrade Tune
Starting at $10/mo or 0% APR with Affirm. See if you qualify
This product is intended for customers who have already purchased a COBB Accessport and a JST Performance custom tune and would like to add on an additional fuel tune (E85 mix, Aux Fuel, Meth, etc). Please select the additional fuel option that you would like to add from the drop down menu below. This option does not include the a full custom base e-tune that is needed before adding an additional fuel. After purchase, please email our tuner at sales@jst-performance.com using the same email chain that was used during previous tuning to notify us that you are ready to begin tuning for a new fuel.
Curious about what kind of power you will see with a custom tune? Check out our blog on ST/RS Basic Modification Paths and Power Estimates!
*Tunes are non-refundable once purchased
*Recommended Accessory: Suction Cup Windshield Mount for COBB Accessport
*Don't forget to throw in a set of NGK Spark Plugs when you order your custom tune! Upgrading your spark plugs or simply changing them out to a new set is just one step to ensure that your car is performing properly during the tunng process!
*We also have tons of JST Swag to choose from when you decide to join the JST team!
