Originally Posted by 151sti
ill look into the fuel but i only run shell or 76 91octane would octane booster help or would i need to mix in race gas?
Stating the obvious here, any STI owner would be smart enough to not run 91octane or mixed fuel or octane booster or any of that crap. you should be running 94octane. mixing fuels will only confuse your ECU. it could be that you had 94octane when you went for your protune.