How do boat manufacturers come up with the max HP you can hang on the transom? Is it how much force the construction of the transom can take? Is it (in the case of light hulled hi-perf boats) how much weight can be floated? I have routinely overpowered boats over the years with no problems.

Thanks - and since this thread does not get a whole lot of activity I will post the same question in set-up and rigging.