Tell your friend the decibel level is not an issue of concern. Then tell him what may be of concern is his self-defense scenario or concept of what constitutes legal self-defense situations. Ask him why driving his car away is not part of the situation. Ask him why is the bad guy sitting next to him in his car while he is driving around. Ask him just how this imagined situation came to be, and if his role in it is innocent and random or is he putting himself there.
It won't matter what he uses inside the car, his ears are going to ring for a day or two. Do tell him not to use any Magnum caliber, though, that's probably good for a week.
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