R44 BMW G80/G81 M3, G82/G83 M4 & G87 M2 S58 Stage 2+ Port Injection Fueling Package (720 WHP+)

Unlock the next level of performance with the R44 Stage 2+ Port Injection Fueling Package, engineered for S58-powered BMWs already running Stage 2 hardware and software. Designed to support builds targeting 720+ wheel horsepower (approximately 850+ bhp), this comprehensive kit provides the components needed to safely introduce port injection and ethanol capability to your G8X platform.

Whether you're looking to push the limits of a hybrid turbo setup or prep for full-frame turbo upgrades, this package ensures precise fuel delivery, advanced control, and high ethanol compatibility. The core of the system features a Precision Raceworks port injection kit — available for both factory and CSF intake manifolds — paired with Injector Dynamics high-flow fuel injectors and the powerful MOTIV ReFlex+ standalone controller.

To support ethanol blends like E50–E85, the kit also includes a genuine Continental ethanol content sensor, Precision Raceworks AN fittings, and a plug-and-play ReFlex+ installation harness by Mike Ball, available for both LHD and RHD vehicles.

This package transforms your S58 engine into a fully flex-fuel capable, high-output system ready for serious road and track use.

Key Features:

• Designed for G8X S58 BMWs already running Stage 2
• Supports 720+ WHP with appropriate tuning and turbos
• Enables high-precision port fuel injection
• Ethanol-compatible (E30–E85 blends) with real-time monitoring
• Plug-and-play harness options for LHD and RHD
• High-quality components from trusted performance brands

What’s Included:

• Precision Raceworks S58 Port Injection Kit (Standard or CSF version)
• Injector Dynamics Fuel Injectors for S58/B58
• MOTIV ReFlex+ Control Unit
• Continental Ethanol Content Sensor
• Precision Raceworks 5/16” Ethanol 360° AN Fittings
• Mike Ball Plug & Play ReFlex+ Installation Harness (LHD or RHD)

Compatibility:

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

For use on vehicles already equipped with Stage 2 tuning and suitable supporting mods.

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.