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Ignitions and Electrical› Computers, Chips, Modules and Programmers

MHD Tuning

Flex Fuel Kit

Name: Flex Fuel Kit
Brand: MHD Tuning
SKU: MHD_FLEX_G3

$499.99 $475.30 Save $24.69

SKU: MHD_FLEX_G3

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$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Easy — 1–2 hours

Overview

This kit allows the engine computer parameters to adjust on the fly based on the E85 content in the fuel tank. Installation is straightforward, featuring a plug-and-play design with no splicing or soldering required.

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This allows for real-time adjustment of engine computer parameters based on the ethanol content of your fuel, enabling seamless switching between different fuel blends. The kit includes an Ethanol Analyzer Module, Ethanol Sensor, a custom plug-and-play (P&P) piggy harness, and custom P&P hoses from Precision Raceworks. Eye protection and gloves are also provided for installation. The system is plug-and-play, featuring pre-made connectors and fuel hoses tested to withstand 145 Psi (10 bar) of static pressure. The kit is compatible with a range of BMW models featuring N55, S55, B58, and S58 engines. Specific supported models include F22, F25, F3x, F1x, F4x, and F8X with N55/S55 engines, F series Gen1 B58B30M0 with Automatic Transmission, G30 (5 Series) and G01 (X3 Series) Gen1 B58 engines with Automatic Transmission, G20, Supra MKV, G01 (X3 Series), and G30 (5 Series) Gen2 B58 engines with Automatic Transmission, and X3m, X4m, M3 G80, M4 G82 with S58 engines and Automatic Transmission. An "Open Wire" option with PosiTap is available for manual transmission cars. It is crucial to note that without the correct tune for the specific E85 blend being used, the engine may not operate correctly and could be damaged. The system facilitates autotuning based on real-time ethanol content, ensuring optimal performance and engine health when used in conjunction with an appropriate MHD tune.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

Brand	MHD Tuning
Part Number	MHD_FLEX_G3
Category	Ignitions and Electrical

Videos

MHD CAN FlexFuel Analyzer QuickInstall Kit - Installation Video, F80

MHD FlexFuel Kit - G20 B58 or G80 S58 Install

MHD CAN FlexFuel Kit - F30 Gen1 B58 Install

MHD CAN FlexFuel Analyzer Kit - X3m S58 Install

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How to Enable FlexFuel Feature in MHD

DIY FLEX FUEL KIT FOR BMW N55 & S55! WORKS WITH MHD OR BOOTMOD3!

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BMW locked your ECU to prevent tuning. Today, we UNLOCK it... 🇺🇸NOW AVAILABLE IN THE USA🇺🇸

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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