From reading the subrau STi forums, nope. They up their boost and run a 50/50 mix of Shell 91 and Toluene. They don't recommend you let it sit in your tank for a long period of time, but other than that, peeps say it works sweet and smells good too.
When I flash my GF's ECU in her bike I'll add some ignition timing and see how it does
-Jamie M.
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