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    SKU: FS.POR.991GT3.ET

    Porsche 991 GT3 / GT3 RS ExperTune Performance Software

    Excluding GST
    Achieve maximum power from the Porsche 991 GT3 3.8L / 4.0L engine without sacrificing driveability or reliability by optimizing the engine's performance. Fabspeed Motorsport offers an alternative tuning method for vehicles equipped with ECU's that traditionally required bench flashing. No longer do you need to remove your ECU and mail it in for a tune. The Handheld device interfaces with the OBD-II port on your vehicle and your computer to complete the tuning process. Simply flash your GT3 with a Fabspeed ECU Tune utilizing the included handheld tuner. Performance ECU software upgrade improves horsepower, torque, and driving characteristics by reprogramming various sensor inputs, air/fuel ratios, and boost pressure (if applicable).
    Fits all Porsche 991 GT3 3.8L / GT3 RS 4.0L vehicles (2014-2016)
    GT3 RS with Stock Hardware
    Stock = 434 whp / 316 ft-lbs
    Tuned = 440 whp / 323 ft-lbs
    Maximum gains of over 15 whp and 10 ft-lbs of torque at 7500 RPM
    Peak power gains of 6 whp and 6 ft-lbs of torque
    GT3 RS with Fabspeed Exhaust - coming soon
    GT3 with Stock Hardware - coming soon
    Read stock data on vehicle via OBD-II port with Handheld
    Interface Handheld with software on your computer and send in data to Fabspeed Motorsport via email to
    We use this data along with information you provide about your vehicle to write a tune for your specific setup and email back your custom tune in 1-2 business days
    Write the Fabspeed ECU Tune to your Handheld, then to the vehicle with the Handheld
    Enjoy your increased performance!
    No need to send your ECU in to return to stock - simply use the Handheld to flash back, then to your Fabspeed ExperTune again at any point!
    Please review our Tuning Guide in the instructions above and email the ECU Tuning Information form to us. We utilize this form to ensure we meet your needs and consider your modifications to deliver the best possible results.
    You must have access to a PC / Windows computer (Mac OS not supported) to upload your factory file information to us via email and in turn apply our ECU Tune to your Handheld device.
    Upon sending us your vehicle information, our tuner will email you a custom ECU Tune(s) within 1-2 business days.
    The Handheld device "marries" with your vehicle and can only be used on one vehicle.
    • INSTALL GUIDE - MyGenius Tuner.pdf
    • HP (whp): +15 TQ (ft/lbs): +10 WT (lbs): N/A