Our cars are set up for 91-93 octane. If your in a state that sells 93 octane, I see no reason to run this. It can actually cause you to loose power. Engines with high perf. mods, may benifit from it, but why not give it a try. You should run your car at the track or on a dyno, and really come up with a consistant baseline, and add it to the fuel.
I don't think your going to see much from it. If your running a VEC2 and have it allowing greater advancement on the timing, then it may well prove benificial.
I know I can kill the spark knock in my 84 Chev Truck engine. I tested this by running the timing up to where it required premium, and put regular in the tank, and it knocked badly. One can of Amsoil octane boost, and it stopped the knock completly. Half a can with 15 gal. patially stoped it.
By the way, octane boost has very little effect when added to premium, but a dramatic effect when used with regular.