What have you done to your scooter so far? BBK's are cool, but there is a lot you can do to make your scooter faster before you go to BBK IMO.
I would add a pipe if you haven't already, then rejet carb, then add a pod air filter and rejet carb again, and at some point you will probably want to tune your CVT.
The pipe, carb jets, CVT parts will cost some $'s but should be a lot less than BBK. After you install BBK, you will probably be spending $'s on a pipe, carb jets, CVT parts anyway, plus more stuff you are maybe not aware of yet. If you buy the right pipe, it will work with your BBK, plus the jets, and CVT parts may too.
I have Super 9 LC with OEM 49cc and it's screaming for me. I have analyzed this over and over, and think it's more cost effective to get 150 or larger 4T scooter, when I want to go faster than maybe 50mph. You can get more power with BBK, and have great fun doing it, but maybe not the best plan if on a tight budget, just my 2 cents.
By the way, I may do a BBK at some point, but who knows. I learn something new about scooters often and change my mind about what best to do, but I am having great fun doing it. Cheers