on a stock shee pro circuit recomends you only change the mains for there pipe,you can call them for the size, they ship a main with the pipe so you wont have to dick around a whole bunch, maybe throw some washers on your clutch springs while your at it and when you feather the clutch out of corners or when just rolling down a trail your shee will come on and not stop pulling till you let off the gas, you could probally get by with a k&n filter too with just those mains, i have a shee that runs great with pc's, needle in the stock position, stock piliots, just the mains with a k&n, it might run shitty after about 3000 feet, but unless your in the mountains thats a good setup.........P.S. skip the boost bottle