Tarzan Yamada - 850HP Time Attack Subaru - EcuTeK The video below shows the 2008 Subaru Impreza WRX STI Time Attack car making about 700hp at this time (600whp) in its life. Around the end of 2011 I was able to push the vehicle to 850 hp or 700whp on the EcuTeK engine management software with room to spare at only 42 pounds of boost.
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