Take full control of your port injection and flex fuel integration with the TMS ReFlex™ Plug-and-Play Harness Kit. Designed specifically for BMW™ B58 and G8X™ engines, this harness connects seamlessly to essential engine sensors and actuators, allowing for a streamlined, modular installation experience.

Whether you're expanding your tuning capabilities or prepping for future upgrades like methanol injection or nitrous, this harness provides the ideal foundation — clean, fully reversible, and ready to integrate with your ReFlex Plus™ system.

Includes

TMS ReFlex™ Plug-and-Play Harness
Connects to port injection, ethanol sensor, low pressure fuel sensor, charge pipe, intake CAM, and crank sensor — all without cutting or splicing.

CAN + Power Splitter
Routes power and CANBus to the ReFlex™ harness via the Body Domain Controller in the passenger footwell, behind the kick-plate.

Auxiliary Cable Pack
Includes four 8-foot cables that plug directly into ReFlex™ auxiliary ports (Aux Out 1/2/3, Aux In 4). Ideal for future expansion such as:

• Methanol injection
• NOS
• Additional sensors

Motiv ReFlex Plus™ Controller (Optional)
Available with or without ReFlex Plus™.

ReFlex Plus™ Mounting Bracket (Included with ReFlex Plus™)
Installs in the access compartment next to the engine bay on the passenger side to hold the ReFlex™ securely in place.

Compatible Car Models

B58 GEN 1 Models:

• 2015–2019 BMW™ 340i (F30 / F31 / F34)
• 2016–2019 BMW™ 440i (F32 / F33 / F36)
• 2016–2021 BMW™ M240i (F22 / F23)

B58 GEN 2 Models:

• 2018–Present BMW™ 340i (G20)
• 2021–Present BMW™ 240i (G22)
• 2022–Present BMW™ 440i (G42)
• 2018–Present BMW™ X3M40i (G01)

G8X Models:

• 2021–Present BMW™ M3 (G80)
• 2021–Present BMW™ M4 Coupe (G82)
• 2021–Present BMW™ M4 Convertible (G83)
• 2023 BMW™ M2 (G8X)
• 2019–Present BMW™ X3M

Click HERE for installation instructions.