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Get the most our of your GT3 or GT3RS with M-Engineering's ECU calibration. With optional Map Switching you can independently select your power level based on the fuel you use. Map switching can be customized based on your needs, so please reach out to discuss your particular application.   Example of Map Slot Setup: Slot1 - Stock Power Slot2 - 93 Octane Slot3 - 100 Octane Slot4 - E85 Slot5 - Valet   NOTE: This requires the ECU to be shipped to M-Engineering and bench flashed, so please allow appropriate time for turnaround.