Do you have to be careful if you use an octane booster? Is there a certain amount you have to put in? Will you gain a little power using it? Thanks

In stock form, your sled will run best on 87 octane, fresh fuel.
Premium fuel will actually cause loss of power.
Octane does not make a more powerful explosion, it only changes WHEN the fuel ignites. Unless youv'e got mods that give you higher compression and or advanced timing, higher octane will do you no good whatsoever. Your best bet is just to make sure you have quality, fresh gas.