Richard,
I am looking into that, and I have to get low level switch soon also. I am really good at checking my resivior, I check it everytime I get out of the car almost, but I am going to get one. That 12:1 AFR seems to work the best on the Imprezas, and it didn't knock once. I am not running that much boost on the road though. Only 22 lbs max on the road, but still pulls way harder than before.
DP
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