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*Ford Focus ST/Focus RS/Fiesta ST/EB Mustang Custom E-Tune

JST Performance, LLC

*Ford Focus ST/Focus RS/Fiesta ST/EB Mustang Custom E-Tune

$ 170.00

This product is intended for customers who have already purchased a COBB Accessport and want to upgrade to a JST Performance custom tune. A custom tune can be completed via e-mail or road tuning. Creating a full E-Tune allows us to work with your car's current modification list to create a custom tune specifically for you and your goals! We can incorporate 5 way map switching, FFS, LC, Etc. Step it up even more by purchasing an E30/WMI tune to be included with your custom tune set-up. By adding an E30/RGA/WMI tune, you receive a full 91/93 octane tune as well as the additional fuel tune. Select your tune options from the drop down menu.

*If additional modifications are added (excluding aftermarket turbochargers) during the tuning process, or after completion, a retune fee will be required for any non-lifetime tune customers.

JST Performance now offers a lifetime tuning option. This means that you can purchase our lifetime tune for 91/93 and get unlimited re-tunes for as long as you own your car. Going from Stage 1 to Stage 3? No problem, with a lifetime tune, your covered!* 

*Changing or adding another fuel option/aftermarket fuel system or upgrading to a big turbo will require an additional tune purchase unless the big turbo lifetime tune option was selected initially.

*Big Turbo Lifetime tunes only cover tuning on one big turbo per vehicle. If you upgrade your big turbo to another big turbo or stock turbo, a tune upgrade may need to be purchased.

*Lifetime tunes are only valid for the original purchaser of the tune. Lifetime tunes do not transfer if the vehicle and/or Accessport is sold, or from vehicle to vehicle.

After purchase, be sure to look for the download button in order to download your tune information sheet. It is the customer's responsibility to fill this sheet out and return via email to begin the tuning process. Contact us at with any tuning related questions.

*Tunes are non-refundable once purchased

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