Quote:
Originally Posted by A1337STI
[random theory - if the added octane let my car boost higher than the fuel injectors would have to inject more fuel then ever before and maybe one of them wasn't up to the task ... I did do a an ecu reset directly after doing that so its possible, or reads well to me ... ]
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Higher octane gas will not "let your car boost higher" unless you've reprogrammed the ECU to allow higher boost. Using an octane booster will do *nothing* for the car unless it was already pulling timing due to poor gas. And at our altitude, you can nearly run a stock STi on 89, meaning 91 is already *plenty* high.