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Around 1kwrms, a new battery shouldn't be needed, but couple of things to consider, that can change that are....
How efficient of an amp(s) are you going to run. the more current hungry an amp is, the worse for the battery it is.
How often are you going to be at full tilt. If you are only going to be full blast for a moment or two, you're probably safe. If you plan on cranking all the time, a battery might be in order.
Also, although probably not an issue in a new car, what condition the battery is in already. A battery going bad is going to go a lot faster with a system on it. Someone posted the factory alternator is 150amp so probably not an issue. But a weak alternator isn't going to like a strong system either.
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