It all depends on the budget, and what level you want to go to. What sort of power levels do you want to attain?
Very high levels means a full rebuild on the motor and lowering the compression ratio to match the extra psi of boost, plus extra fueling, extra exhaust.... You will also need to make sure the suspension and brakes will safely stop you too.
Most motors will take 2psi boost without an issue.
I'm not sure about the ecu on this model, but generally you have to incorporate a MAP instead of MAF and get the ecu to understand whats going on. This is normally done via a piggy back system. The computer is used to dealing with a flow of air, not an amount of positive air pressure to regulate the timing/fueling map.
Yes... i'm a total car nut! Why else would I upgrade my mower to rev to twice its standard rpm!