SiriMoto

S300/K-Pro E85 Flex Fuel Kit

$340.00

SKU: sirimoto-plug-and-play-s300-kpro-e85-flex-fuel-kit

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The SiriMoto Plug and Play S300/K-Pro E85 Flex Fuel Kit allows your Honda Civic, equipped with a K-Series engine swap and either a Hondata S300 v3 or K-Pro v4 ECU, to seamlessly run on E85 fuel and any mixture with gasoline. This system features a sensor that monitors ethanol content and sends real-time data to your ECU, enabling dynamic adjustments for optimal performance. The kit promises huge increases in horsepower and torque, aids in earlier and faster turbo spool, and helps the engine and turbo operate cooler. Premium harnesses are constructed with Mil-Spec Tefzel Wiring and Deutsch DTM Connectors, and feature a flame-retardant nylon sleeve. The kit includes a genuine GM Original Equipment Ethanol Content Sensor, mounting brackets, M6 hardware, and zip ties. Optional fuel line kits (6mm return, quick connect, or -6AN male adapter) are available to suit various fuel system configurations. It is crucial to note that this kit is ONLY compatible with Hondata S300 v3 and K-Pro v4 systems; older versions are not supported. While Hondata's base settings may allow the engine to run temporarily, custom tuning is highly recommended for optimal performance and reliability to ensure proper fueling and ignition timing.

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

BrandSiriMoto
Part Numbersirimoto-plug-and-play-s300-kpro-e85-flex-fuel-kit
CategoryAir and Fuel

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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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