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Roush Flash Pack (15-17 GT)

Item 394062
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Roush Flash Pack Voucher
      • Increases of over 15 RWHP and 19 ft/lb RWTQ
      • Improves Throttle Response
      • Calibration Optimized for 91 Octane Fuel
      • Flashed via a J2534 Interface Tool - A Dealer Service Charge May Apply
      • Optional 3 Year/36,000 Mile Limited Powertrain Warranty Available
      • Fits 2015-2017 Manual and Automatic GT Mustangs


      More Horsepower and Torque. Ford calibrates their Mustangs for the masses not the individual driver. That is why a Roush Flash Pack custom tune is so important to the performance enthusiast. Roush engineers developed their dedicated premium fuel calibrations under laboratory conditions to increase the horsepower and torque of your GT across the entire RPM range. With improved throttle mapping this tune will also give your Coyote powered Mustang a much more aggressive feel. After installing a Roush Flash Pack calibration on your 5.0 GT you will see an increase of over 15 Horsepower and 19 ft/lbs of Torque at 4300 RPM.

      J2534 Interface Tool Required. Just about any dealer can perform this calibration upgrade in under an hour without even breaking a sweat. The Roush Flash Pack Calibration is flashed on to your Mustang's ECU using Roush's RDT software and an industry standard J2534 interface tool. Please note that a dealer service charge may apply.

      Optional Warranty. An optional 3 Year/36,000 Mile Limited Powertrain Warranty is available through Roush. The optional warranty must be purchased within 30 days of the service installation date. Click here to see more details.

      Application. This Roush Flash Pack is specifically designed for use on manual and automatic 2015-2017 GT Mustangs equipped with the 5.0L Coyote V8 engine. This calibration has been optimized for 91 octane fuel, is compatible with lower octane ratings with reduced power and performance.

      Technical Note. This product is not legal for use in California or any other state adopting California emission standards. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

      Fitment: 2015 2016 2017 Details

      MPN# 421995

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (1)

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      Ratings Summary

      3 out of 5 overall rating from 1 customers

      • September 08, 2016

        3 2016 GT - Shelby1000


        It's decent for what it is, would much rather go with something else. Although, it's not bad, just not what I expected.

        Helpful (12)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      I had the Roush cold air intake and then purchased this tuner. Come to find out its was not a performance tuner. My mechanic states I can not take the inter ventura out and use this tuner. I want to add more horsepower . What should I get?

      • We would Recommend the BAMA X4 tuner, or BAMA Rev-X tuner for the best performance gains.

      Helpful (1)

      i have a 2016 mustang gt and i had bought the roush CAI and wasn't aware that i needed the whole kit to get full benefits from the CAI, in fact i learned with out tune im losing torque. what exact tune do i need to or product do i need to use this roush CAI to gain what the reviews supposed to have. i know i should have researched more be four. but little late now... do i return the CAI and then purchase the whole kit or can i keep what i have and finish the full benefit of install. thank you for help if someone can recommend my next step!

      Will this software allow you to do a crank relearn like the SCT tuners? I had a shop install a new clutch kit with flywheel from Exedy. I saw a YouTube video from CJ Pony parts that it’s required. I have a Roush Stage 1 supercharger and wanting to get rid of the check engine light. Any advice would be appreciated.

      • No, this will not allow you to do a crank relearn.

      Helpful (0)

      Does this void the warranty? It does say "a custom tune"

      • Depending on the specifics of your warranty, this Roush Flash Pack could void your warranty. We would recommend speaking with your Ford dealer regarding your specific warranty to determine if this would alter your warranty.

      Helpful (0)

      I have this installed along with the Roush CAI. If I replace the factory mid-pipe with an aftermarket x-pipe, do I need to re-apply or update the tune?

      • As long as you are not changing anything with your headers and your catalytic converters, than you have nothing to worry about. However, being that you have a Roush tune, it's always good to have a good contact with those writing your tunes and asking them directly the need to change a tune or not is always helpful.

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Flash Pack Voucher

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