Thanks for prompting me to get round to doing something about this, had thought about it a long time ago and then it just got put on the round to it list. Hope its a big waste of cash (i.e. never needed), Dry Powder for the car CO2 and Foam for the garage, now just got to clear some wall space - (its going to be a cross between Jenga and Tetris)
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I wouldn't recommend powder for a car, if it discharges accidentally it will cause that much damage it will write off the car (I know of somebody that it happened to). Foam is what is used in most rally & race cars & that is what I would use.