I would be more worried about wrecking your hearing…You need to figure out why you must call attention to yourself by disturbing the peace…
But if you insist, YES a 200 amp alternator, correctly installed, will cure your need for more power…But it’s not that easy…Big alternators need multiple belt drives or at least a completely different belt arrangement…to carry the heavy load imposed by the oversized alternator…
Another solution is to power the amp from a 100 amp deep-cycle boat battery carried in the trunk…