6PSI sounds reasonable and safe!
And, if it's not enough, I'm guessing it wouldn't be a big deal to raise it a notch or two, once the kit's installed...I mean, installation is the hard part (assuming retunes are easy, right?)
My level of interest in this drops once 91octane is exceeded. I don't want to have to hunt for the 93octane pumps in my area, and, I'm not about to buy additives...
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