S58/B58 Plug and Play ReFlex Plus Install Harness

Precision Raceworks Plug & Play Harness for S58 / B58 – ReFlex+ Compatible

Installing a Motiv ReFlex+ on your BMW S58 or B58 engine? This certified plug-and-play harness from Precision Raceworks makes the job quick, clean, and fully reversible.

No need to cut, crimp, or splice your factory wiring—just connect and go! Your OEM harness remains untouched, allowing you to return to stock if needed.

Why choose the Precision Raceworks harness?

While the main harness included with the Motiv ReFlex+ is excellent, the original sub harness requires splicing into your vehicle’s wiring. This Precision Raceworks version replaces that with a truly plug-and-play solution, saving you time and protecting your investment—without discarding the high-quality main harness that comes with the ReFlex+.

• Certified by Motiv Motorsports
• 100% Plug and Play – no permanent modifications
• Works with MHD, MHD+, EcuTek, and BM3 tuning platforms
• ISO 9001 certified manufacturing
• Automotive-grade wiring for durability
• Quick and easy installation
• Completely reversible – preserves your factory wiring

Package Contents:

• Plug & Play sub harness (connects to the standard ReFlex+ main harness)

Recommended Accessories (Sold Separately):

• Motiv ReFlex+ Controller
• Plug & Play Flex Fuel Harness
• Precision Raceworks Ethanol 360 Fittings
• Continental Flex Fuel Sensor (Genuine)
• Motiv 0–10 bar (150psi) Fuel Pressure Sensor
• Precision Raceworks B58 or S58 Port Injection Kit
• ReFlex+ Main Harness (included in the standard ReFlex+ kit)

Note: This product replaces the sub harness only. You still need the standard Motiv ReFlex+ universal main harness to complete the installation.