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Subaru Impreza WRX STI version (2009-2011)
Standard features are the robust pneumatic actuator
smoother power delivery
guarantees low fuel consumption
The internals have been completely redesigned to offer a more distinct difference in sound when the valves open and shut
McLaren JB4 Performance Tuner for M838T Engines (BETA) MK5 R32 TCU Subaru Impreza WRX STI versionInstant Horsepower and Torque Gains The JB4 is a plug and play McLaren tuner that plugs into easy to access sensors in the engine bay and works with your factory ECU tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. It features a 64mhz processor allowing sensors to be sampled 800 times per second using dedicated 10 bit digital to analog converters, ensuring smooth and powerful performance. No ECU flash
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