BMW S58 FlexFuel Kit

The 5150 AutoSport Basic Flex Fuel Kit is now available for the BMW S58 engine, found in high-performance models like the G80 M3, G82 M4, G87 M2 and X3M / X4M. This kit is a simplified, engine bay-mounted alternative to our High Flow Flex Fuel Kit, providing an efficient and cost-effective way to add flex fuel capability to your S58-powered vehicle without permanent modifications.

Utilizing specialty 5/16" plug-and-play fittings, the kit connects directly to OEM fuel lines, avoiding the need to fabricate or splice fuel components. Combined with bootmod3 Flex Fuel enabled OTS MultiMaps or custom tuning, this kit allows you to run any ethanol blend, including E85, with real-time ethanol content monitoring and full integration with your vehicle’s CANBUS system.

Key Features:

• Engine bay-mounted for easy installation — no cutting or underbody work required
• Installs in minutes using OEM-compatible specialty fuel line fittings
• Fully reversible — remove and return to stock without evidence
• Features a CANBUS-enabled Ethanol Content Analyzer (ECA)
• Seamless bootmod3 CustomROM integration with MultiMap support
• Includes a genuine Continental Flex Fuel Sensor and plug-and-play wiring harness
• Designed specifically for the BMW S58 engine platform

Whether you're tuning for track use or maximizing performance on the street, this kit makes flex fuel conversion simple, clean, and reliable.