it's a 2 speed!
those kits are great, the airsal with the 10mm wrist pin.
if you want some even funner/cheaper stuff to do, just buy an a35 cylinder on the buy sell forum for cheap. get some reeds and a proper intake as well. you use your a3 piston, in the a35 bore. you will need to cut windows in it like an a35 piston. you get reeds, and cooler fins...
i like just about all the exhausts on treats for these. the tecno circuit rules, but is kinda flimsy. the homoet is awesome, but you gotta wait for it.
airsal kit + circuit + 15 sha = goes up hills fast and does 40+ if you do it right.