in order to run the differrnt domes, you need a aftermarket head. I beleive the stock head is about a 23 cc. The lower the number is the higher your compression will be. HIgher compression means improved performance and you need need a higher octane fuel.
Boost bottle's are shit, Save the 30 beans and go get drunk or something
Although i have no 1st hand experience with 2:1 carb, from what i have gathered you gain on the bottom end... But what you gain on bottom you lose on top. If your a MX'r a 2:1 might be for you, if your a duner i wouldnt get one