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Random Quote: Why would women want a man with a 'six pack' when she could have me and the whole KEG!
I have a 21 center console with a 225 mercury. I am spinning a 17 inch mirage plus. Gets me to 5500 RPM and 46-50 mph depending on load. I think you may be a little heavier, but you have more hp. Your 21 pitch may be too large.