Well you should notice your passing vettes more and more hehe. So octane booster...As far as stock is concerned it doesn't do much of anything for you. More octane simply allows you to run more boost, more spark advance or hit the nitrous a little safer but if your car is stock and not pinging it really won't do anything that premium wouldn't. If you start modifying your car (higher compression, nitrous, smaller pulley, performance chip) and notice A) the performance isn't quite what you expected or B) you notice a pinging sound on hard accelleration then you could probably benefit from the booster. Thats my thoughts
Stuff got done.