TMS - Reflex+ Flex Fuel Kit & Harness for BMW Gen 2 B58 / S58

Take full control of your port injection and flex fuel tuning with the TMS ReFlex+™ Flex Fuel & Harness Kit. This all-in-one solution combines a Motiv ReFlex+, a 10-bar fuel pressure sensor, our Race-spec Plug-and-Play Harness, and a complete flex fuel plumbing system — engineered for a clean, reliable, and fully reversible install.

Designed for specific chassis applications, this kit eliminates wiring headaches, simplifies your fuel system upgrades, and lets you unlock advanced features like flex fuel tuning, boost by gear, and full port injector control — no additional ethanol content analyzer required.

Includes

TMS ReFlex™ Plug-and-Play Race Harness

• Connects directly to the transmission plug near the DME
• Full access to all ReFlex+ I/O
• Sealed, heat-rated, and abrasion-resistant components
• Completely bench-tested and fused (10A)

Motiv ReFlex+ Controller

• Advanced standalone controller for port injection and I/O
• Built-in Flex Fuel logic (requires tune) – no external analyzer needed
• Full CANBus integration via PT CAN 2 (ECUTek & MHD+ compatible)

Motiv 10-Bar Fuel Pressure Sensor + Fitting

• Plug-and-play connection to TMS harness

Auxiliary I/O Cable Pack
Pre-wired I/O ports for future upgrades like:

• Nitrous
• Meth injection
• Boost control solenoids
• Fuel pressure
• Fluid level sensors
• And more

ReFlex Mounting Bracket 
Installs in driver’s side brake booster area.

Chassis-Specific Flex Fuel Plumbing Kit
Pre-assembled stainless steel & nylon braided -6AN fuel lines.
Clean routing tailored for each chassis engine bay.

• 10-micron stainless fuel filter (protects OEM injectors)
• T-fitting to split fuel between DI and PI systems
•  Line to port injection rail
• AN-8 to PI rail adapter fitting

Compatible Car Models:

B58 GEN 2 Models:

• 2020+ BMW™ M340i (G20)
• 2021+ BMW™ 240i (G22)
• 2022+ BMW™ 440i (G42)
• 2018+ BMW™ X3M40i (G01)
• 2020-present Toyota Supra™ A9X

G8X Models:

• 2021+ BMW™ M3 (G80)
• 2021+ BMW™ M4 Coupe (G82)
• 2021+ BMW™ M4 Convertible (G83)
• 2023 BMW™ M2 (G87)
• 2019+ BMW™ X3M