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Re: "hearing" knock. I still think the driver shouldn't hear audible knock - the sensor should detect slight knock and start adjusting timing. There shouldn't be 5 seconds of rattle from under the hood before the engine reacts.
Re: hp. On my WRX, stage 1 tuning, I use the 91 octane map. It's rated at 5hp less than the 93 map. Extrapolating you might say we're losing 3-4hp on the BRZ, but I don't think you can make a direct comparison between the two engines. And 3-4hp is probably the variance from one identical engine to the next anyways, and likely not noticeable.
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