ET4 motor tuning

Hi

I’ve a piaggio ET4 and i want more torque and of course more power.

i see a polini and a malossi cylinder but i don’t see camshaft for each cylinder…

do you know which cylinder is the best ?

Do you know if there exist a camshaft for this scooter ?

do you have suggestion for me to have a good motor ?

thanks a lot

regards

Tristan