Fabspeed XperTune for Porsche 955 Cayenne S 4.5 V8

Read the original Cayenne S 4.5-liter ECU with the supplied handheld and submit the car’s actual hardware details. This calibration is for the naturally aspirated S engine, separate from the twin-turbo files. Fabspeed Motorsport designs performance exhaust systems, air intakes and ECU tuning in Fort Washington, Pennsylvania. Porsche and other sports-car applications are developed through dyno testing, road evaluation and racetrack work.

Technical Details

• Manufacturer product reference: FS.POR.955V8.ET.
• Manufacturer lists 340-to-362 hp output in its comparison; this is not a wheel-horsepower guarantee.
• Later 4.8-liter S/GTS cars use separate programming.
• Includes the listed OBD-II handheld programming device, linked to one vehicle.
• Requires a Windows PC; macOS is not supported.
• Submit stock ECU data, fuel specification and a completed vehicle/modification form.
• Retained stock-file restoration follows the supplied procedure; confirm current file turnaround and any additional service fees.

Use restrictions

The calibration must retain required emissions controls. Fabspeed excludes requests to disable emissions equipment or its monitoring.

Installation Resources

• Handheld ECU tuning guide (PDF)

Manufacturer Videos

Fabspeed XperTune Handheld Tuner Tutorial | Including MyGenius Software Tutorial

Demonstration vehicles may have additional modifications. The selected product configuration determines what is supplied; a video does not establish fitment or guarantee a particular sound or output.

Need help matching this part? PMB Performance brings over 20 years of parts and fitment experience. Send your VIN, ECU reference, fuel and modification list so we can help verify the application before you order.

Fitment & Compatibility