BMW Bluetooth/CANbus Flex Fuel Kits for S58 M2 M3 M4 X3M X4M

Integrate ethanol mixture into your tuning using our unique CANflex system!

If you're running E85 and/or plan to run port injection in your S58, you need this kit!

This is a complete plug & play kit to install a flex fuel kit in your S58 equipped BMW in about 30 minutes.

Our new CANflex ECA sends your ethanol mixture four different ways for the ultimate tuning integration:

• CANbus via user selectable addressing for MHD, BM3, EcuTek, and JB4 integration
• Free CANflex Bluetooth app for iOS and Android
• LED display built into the head unit for quick visual readout
• 5v output for legacy support (older ECUs or non-CANbus JB4 integration)

Offered in both a plug and play harness and a universal harness. Manual transmission vehicles and BM3 require using the universal harness with posi-taps for CANbus.

Vehicle Fitment

• 2020+ F97 X3M and all variants
• 2020+ F98 X4M and all variants
• 2023+ S58 G87 M2
• 2021+ S58 G80 M3
• 2021+ S58 G82 / G83 M4
• 2023+ S58 G82 M4 CSL

The complete S58 kit with CANflex includes:

• Genuine Continental® ethanol sensor
• BMS CANflex LED ECA for use with JB4, MHD, EcuTek, and BM3
• Stainless steel braided fuel lines with black nylon sheathing to protect engine bay components
• Custom fitting allowing easy addition of optional port injection lines via 1/8" NPT port
• Plug & play harness (optional)
• BMW/Supra Accessory Harness for S58/B58 motors

Download the free BMS CANflex apps:

• Android App – Click here
• Apple (iOS) App – Click here

Wiring diagram for the new BMS Bluetooth CANflex Harness

Red: (originally Red/Green) 12v switched power via fuse tap or posi-tap
Black: Chassis ground
Brown: (originally Orange) CAN-
Green: (originally Red/Blue) CAN+
Blue: 5V legacy output for input into JB4

Also available with the original Fuel-It! ECA (Bluetooth and legacy 5v output only)

• Download the Fuel-It! Bluetooth App:

  • Apple (iOS) – Click here
  • Android – Click here

Install Videos

CANflex variants and how to use the new app!

BMS Universal Canbus E85 Analyzer Installation and Review