You're welcome. Keep in mind that it takes 10x the power to double the volume. Eg, if you start with a 100 W amp and want twice the sound, you need to step up to a 1000 W amp. I'm not sure how much bass you want, but 500 W ought to do it in a small car. You'll probably seldom want to use that much on average but it provides some headroom for the "thumps." Of course, if you like it really loud, the sky's the limit.
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