What is the smallest pulley can put on a standard statesman WH 2000 model?

Assuming your car is in good working order, then the smallest pulley you can run is a 3.4 inch pulley (10psi) on 98 octane fuel. If you're running 95 octane fuel, then the smallest you can run is a 3.6 inch pulley (8psi) on 95 octane fuel.