[Diesel_Dave]

Skyking, I like your idea. I've thought a little about doing something like that myself.

I think, ideally, it's much better to use intake temp and underhood temp for control as opposed to boost pressure. I'm not really an electronics expert but I wonder if you could do something like this:
1) Take two theromstats (like a household wall thermostat, not an automotive one). One measuring underhood, one measuring intake temp. Set the thermostats at the "threshold" temp of each (the max allowable temp for each).
2) Have an electric actuator to open & close the shutters (probably could use either a solenoid or a small electric motor)
3) Wire the acuator such that the shutters are normally closed.
4) Supply the actuator power through the thermostat switches in parallel

What this would do is open the shutters when EITHER temp gets too high. Once the temp goes back down, the shutters close again.

Just an idea...