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Boston Whaler and all the other boat builders had to go by the USCG Code of Federal Regulations about overpowering. It states 100 for a reason.
The boat was unsafe at any motor above it.
Your insurance will become invalid, you just gave the company an out, by overpowering.
It is illegal, any marine patrol or USCG will stop you and thats a voyage termination, it ends where they find you.
Please go by the Whaler specs. The law is written in blood, someone had to get hurt or killed to make a law, someone elses, but do not let it be yours.