Flex Fuel Kit

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Flex fuel kits allow a vehicle to safely run multiple ethanol blends by automatically adjusting engine parameters based on fuel content. By monitoring ethanol levels in real time, these systems enable optimized performance, consistency, and reliability when switching between pump gas and ethanol blends.

Flex fuel setups are commonly used on Subaru WRX and STI platforms to support increased power, improved knock resistance, and greater tuning flexibility. When paired with proper fueling components and engine management, flex fuel systems provide a versatile solution for performance-focused builds.

Flex Fuel Kits for Subaru WRX & STI

Flex fuel kits for the Subaru WRX and STI are designed to measure ethanol content and adjust engine tuning accordingly. This allows the engine to take advantage of higher-octane fuel blends while maintaining safe operation across varying fuel compositions.

These systems are often installed as part of a broader fuel and performance upgrade, supporting higher boost levels and more aggressive tuning strategies. Consistent ethanol monitoring helps ensure predictable performance whether running low or high ethanol content.

Selecting the right flex fuel kit depends on your vehicle configuration, fueling setup, and performance goals. Proper integration with engine management is essential to fully realize the benefits of a flex fuel system.