Max cv/hp/kw

hello 

I have a couple of queries: 

I have a scooter vespa px 150, I'll do a upgrade and this is the configuration that I thought: kit malossi MKII 166, carburetor mikuni 30mm, kawasaki kx 125 valve reed, plus I'm going to cut a little crank on the side where it is admission, obviously adding porting to the respective motor carcasses. As for now I doubt escape between the sip road, sito plus or polini with output under the shift selector. 

My question is basically because I heard from someone who said that rose to 33 hp and that seemed a bit crazy; really i want to know how much it can increase the power on my scoot

Thanks