Fabspeed Tuning

Porsche 991 GT3 / GT3 RS XperTune Performance Software


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. o 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-lbsTuned = 440 whp / 323 ft-lbsMaximum gains of over 15 whp and 10 ft-lbs of torque at 7500 RPMPeak power gains of 6 whp and 6 ft-lbs of torque

GT3 RS with Fabspeed Exhaust - coming soon

GT3 with Stock Hardware - coming soon

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.

Special requests and tune file upgrades may be subject to additional fees.