Fuel-It! Flex Fuel Kit for S58 BMW G80 M3 & G82 G83 M4

If you're running E85 or ethanol mixes in your G80 M3 or G82 G83 M4, you need this kit!



Know your exact ethanol content in real-time via the Fuel-It! or JB4 app on your smartphone or tablet.

This complete flex fuel kit installs in under 30 minutes and reads your exact E85 mixture in the Fuel-It! smartphone app or JB4 app if equipped. Features CNC machined fittings for a quick plug and play installation with nylon sleeved stainless steel braided fuel lines for life long leak free operation.

The complete kit includes the following:

• Genuine Continental ethanol sensor
• Fuel-It! Bluetooth Universal Analyzer
• Two stainless steel braided fuel lines with black nylon sheathing to protect your other engine bay components
• Proprietary custom billet fittings for plug and play OEM integration
• One wiring harness with Posi-tap connector
• Supports stand-alone Bluetooth operation with the Fuel-It! app

• Bluetooth (iPhone or Android app must be downloaded to use this feature)
• If you are using an Apple product the app can be found by clicking here
• If you are using an Android product the app can be found by clicking here

This kit is compatible with the following:

• 2021+ S58 G80 BMW M3 
• 2021+ S58 G82 G83 BMW M4

*We have also made it optional  to purchase all the items ala-cart should you choose but for the kit to work it must include the Fuel Lines, Ethanol Sensor, and Analyzer.

*For the BMW G-series JB4 platform connect the white wire to position #4 on the JB4 25 pin harness. Select WMI page option 2/3/4 input to enable.

Install Video

Fuel-it! App Video