Steeda Certified Mustang GT Custom Tune 5.0L Coyote (2018-2020)

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Own an SCT tuning device and want to have the most advanced, safest, most reliable custom tuning available on the market? Then purchase our Lifetime Tunes option and receive our Steeda Certified Custom tunes for your vehicle for as long as you own that vehicle and tuning device.
Part Number: 999 TUNE 18

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Own an SCT tuning device and want to have the most advanced, safest, most reliable custom tuning available on the market? Then purchase our Steeda Certified Custom tunes for your Mustang GT and maximize the performance of your S550. Steeda Certified Custom tunes pass our rigorous standards for performance, durability, and driveability with an impeccable safety record. Developed and tested on our in-house dyno, as well as through hundreds of hours of field testing, both on the street and some of the most demanding race tracks in the country, you can be sure our tunes will deliver safe, reliable power.

Custom tuning is delivered via email. Your tune will be emailed to you in approximately 7 days. If you are ordering separate products do not install your products that require tuning until the tune has been delivered.

Up to 90-Days for changes. Steeda will provide revisions and support data-logging for 90-days after the purchase of the tune. 

Note: Our program only covers the original vehicle owned at the time the customer purchased the tune. New vehicles will require a new purchase of either a tuning device or a new tuning program purchase. Modifications that require dyno tuning are not covered by the 90-Day Tunes. These types of modifications include but are not limited to:

  • Cold Air Intake
  • Aftermarket Camshafts
  • Aftermarket Fuel Injectors
  • Aftermarket, Non-OEM Superchargers
  • Nitrous Systems
  • Major Engine Changes (stroker engines, compression changes, cylinder heads)
  • Crate Motor & Non-OEM Engine Swaps
  • Race Fuels and Non-Gasoline Fuels (E-85, Methanol, Alcohol, etc)

Warning: Not approved for sale in California or states that require a California E.O. #. This part has been designed and is intended for off-road application only. Installation of this part on a vehicle that is driven on public roads may violate U.S. and Canadian laws and regulations. Steeda Tuning will not change, remove or alter any emissions control devices on your vehicle.

Note: Federal and several state and provincial laws prohibit the removal, modification or rendering inoperative of any part that affects emissions or safety on motor vehicles used on public streets or highways. Steeda Autosports assumes no liability for any violations arising out of any federal, state or provincial emissions or safety requirements on motor vehicles arising out of the customer's modifications and/or use of Steeda products. It is the responsibility of the customer to determine if their modified vehicle complies with applicable laws.

This limited warranty is the only express warranty applicable to Steeda Autosports products. Other rights may arise or vary from state to state in the United States. Steeda is not responsible for any time for which you may lose the use of your vehicle, any inconvenience you might be caused, the loss of your transportation or any part thereof, or any other incidental or consequential damages you may have.

Product Benefits
  • Tested and proven on the dyno, street, and track
  • Improved horsepower, torque, and throttle response.
  • 90-Days for revisions and data-logging

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda (Digital)

Vehicle Fitment:

Fits Model Year: 2018, 2019, 2020

Customer Reviews

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Average Customer Ratings


Well Tuned GT
Matt was Great to work with when I contacted Steeda for a tune for my 2019 GT PP1. This tune really woke my 2019 Mustang up. I am completely satisfied.
Did you find this helpful?  3 of 7 Found Helpful
Verified Buyer   from NC on 12/17/2019
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