Porsche 991.1 GT3 / GT3 RS ECU Tuning

Porsche 991.1 GT3 / GT3 RS ECU Tuning

Regular price $3,000.00
Regular price Sale price $3,000.00
Sale Sold out
Add Map Switching?

With the M-Engineering ECU flash for the Porsche 991.1 GT3 and GT3RS, adjustments are made to improve the throttle response, remove top speed limiters, adjust air/fuel ratios, and modify ignition timing and much more to improve the overall driving performance of the 3.8L and 4.0L flat-six engine. M-Engineering still utilizes all OEM ECU engine safety strategies.

We have base ECU Calibrations supporting the following vehicles, click on the link for the Calibration Notes:

Maps are available in Stage 1 and Stage 2 configurations in 91, 93, 100, and E85 fuels. 


Options below can be chosen individually. M-Engineering also provides PDK Tuning for the 991 platform. There is a discount to the entire tuning suite if purchased together here.


  • Live Map Switching
    • Map Switching allows the driver to independently select power levels based on the octane of the fuel or fuel type by using the cruise control stalk. Map switching can be performed with the vehicle running without the need to shut the engine off.
      • Example Map Slot Setup:
        • Slot1 - Stock Power
        • Slot2 - 93 Octane
        • Slot3 - 100 Octane
        • Slot4 - E85
        • Slot5 - Valet
      • Since Map Switching can be customized depending on the individual please contact us when purchasing if you'd like a different setup or would like a custom map slot.






Disclaimer: You accept responsibility and risks of any tunes and added features by M-Engineering. If you are not the end user of the car, you will be solely responsible for notifying the purchaser and/or customer they also accept the responsibility and risks of these and M-Engineering is not liable. M-Engineering is also not liable for voided warranties due to installation of our products. 

Return Policy: All sales are final and non-refundable. M-Engineering provides specific software calibrations for individual vehicle use and is not liable for misuse or vehicle behavior due to installation error or mechanical issues. M-Engineering will work one-on-one with individuals to assist with remote diagnosis to vehicles to our best ability and advise next-action steps as needed. End-users are responsible for vehicle maintenance, integrity of aftermarket parts installation, and having their vehicles up-to-date with their manufacturer's latest updates and TSB's.