does anyone know the different sizes between the stage 2 and 2.5 charger pulley sizes?

my kit currently has a 90mm pulley fitted and only made 220bhp on a rolling road it did have a few air leak issues on the inlet and the charger was wining a bit more than it should but thats all been sorted.

ive asked jamsport the difference and they did confirm the pulley is the only difference but didnt say sizes