R44 BMW G80/G81 M3, G82/G83 M4 & G87 M2 S58 Stage 2 Ethanol Flex Fuel Kit

The R44 Ethanol Flex Fuel Kit has been developed specifically for Stage 2-tuned G8X BMWs running the S58 engine — including the G87 M2, G80/G81 M3 and G82/G83 M4. Designed for drivers who want to extract more performance from their existing Stage 2 setup, this kit enables you to safely run ethanol-blended fuels, most commonly an E30 mix, for increased power and smoother combustion.

This comprehensive solution includes a genuine Continental ethanol content sensor, Precision Raceworks 5/16” Ethanol 360° AN fittings, and the MHD CANbus Flex Fuel Quick-Install Kit. Once installed, your vehicle will have real-time ethanol content monitoring and seamless ECU integration via MHD — allowing your Stage 2 tune to adapt accordingly.

This is not a tuning solution itself, but rather the hardware needed to support flex fuel compatibility on already Stage 2 tuned vehicles. With high-quality, trusted components and a straightforward installation process, this kit is ideal for enthusiasts looking to upgrade their fuel system and maximise their current setup’s potential.

Key Features:

• Developed for BMW G8X S58 engines already running Stage 2 tunes
• Enables safe use of ethanol blends (e.g. E30) for enhanced performance
• Real-time ethanol content monitoring via MHD
• Plug-and-play compatibility with CANbus integration
• Includes premium-grade fittings and sensors
• Designed for daily, fast-road, and track use

What’s Included:

• Continental Ethanol Content Sensor
• Precision Raceworks 5/16” Ethanol 360° AN Fittings
• MHD CANbus Flex Fuel Analyser Quick-Install Kit

Compatibility:

• BMW G87 M2 Coupe
• BMW G80 M3 Saloon
• BMW G81 M3 Touring
• BMW G82 M4 Coupe
• BMW G83 M4 Convertible

Suitable only for vehicles already running Stage 2 software that supports flex fuel tuning.

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.