The patented ProFlex™ Commander adaptive flex fuel system for 1998-03 BMW E39 M5 allows you to start making more power and running cooler with E85. True plug and play flex-fuel for your M5 in about an hour with no tuning required. ProFlex Commander Features: Complete system - everything you need to run E85 100% Dyno tested for safety, durability and power gains Easy installation for your professional BMW shop (see note) Patented BlendSense™ technology adjusts in real time with 30 millisecond refresh rate True flex fuel - switch from gas to ethanol and back anytime Improved injector management for more power on gas or E85 7-10% More wheel HP and torque on E85 (dyno proven) No tuning required - Compatible with stock or performance gas tunes; instantly adapts to new tunes Cleaner emissions and cooler cylinder, oil and coolant temps Race grade fuel at the pump - high octane, low cost Compatible with power adders and bolt-ons ProFlex Connect app provides accurate, real-time ethanol content on your iPhone or Android device via BT Wireless communication Cold Start Plus™ - improves fuel atomization for easier starting in cold weather NOTE: While most of our systems are DIY your M5 requires specific routing around sensitive accelerator linkage. Professional installation is recommended. This System Fits: 1998-03 E39 M5 Which ProFlex Commander Option Should You Choose? Standard Commander The Standard Commander is the go-to choice for stock or lightly modified vehicles running factory fuel injectors and naturally aspirated setups. If you haven’t upgraded your injectors or added forced induction (like a supercharger or turbo), this is the perfect fit. No tuning required Seamless flex fuel performance Ideal for street-driven and daily performance builds Commander Pro The Commander Pro is built for high-performance builds with upgraded fuel systems. If your vehicle has (or will have) aftermarket forced induction or larger fuel injectors (600cc / 60 lb/hr or bigger), the Pro is your move. Works with your current setup — and scales as you upgrade Recommended for turbocharged or supercharged builds Features more precise injector management for controlling big injectors. Bottom line: Got boost or big injectors? Go Pro.If not, the Standard is all you need. Which Fuel Sensor Do You Need? Standard Sensor The Standard Sensor delivers rock-solid ethanol content readings and is great for most stock or mildly modified fuel systems. Accurate ethanol % readings Reliable performance for daily and spirited driving No extra bells and whistles — just works E-Sense Sensor Upgrade The E-Sense is designed for modified fuel systems where precision and performance matter most. Higher flow capacity for high-horsepower builds Adds fuel temperature monitoring Unlocks real-time data in the ProFlex Connect app Rule of thumb:If your fuel system is stock, go Standard.If it’s modified, go E-Sense. The ProFlex Commander product line is backed by a limited 12 month warranty. Learn more. Vehicle Fitment Submodel Engine Years E39 M5 4.9L V8 S62 1998-2003 BMW E39 M5 dyno on E85 The ProFlex Commander and E85 added 24WHP and 18TQ to this BMW E39 M5 on the dyno when compared to pump gas (93 octane). Installation Guide This video shows the wiring harness installation steps for the E39 M5. Click here to download installation instructions. PROFLEX Connect App With the free PROFLEX Connect app you can connect your smartphone to your PROFLEX Commander and view your vehicle’s ethanol content in real-time, locate and navigate to E85 pumps near your location and run system monitoring and diagnostics. Available for iOS and Android. Click here to learn more.
