Don't Waste Your Money !!
If you read the Catalina's literature on your boat, they indicate very clearly that higher horsepower does not equate to higher speeds. You may be able to achieve hull speed perhaps a bit quicker, but you will not go faster.I routinely keep up with other Cat 22's who are using 10HP to my 5HP, and they don't get anywhere faster than I do.If you want some noticeable improvement however, I'd check with you local dealer about changing the pitch of the prop or perhaps going to a 3-blade versus a 2-blade. That might give you a better "bite" when running against a strong current or tide. Besides, hanging a larger engine on the back only adds more weight which will result in poorer sailing performance.Good Luck,Ed P. "See Da Moon" S/N 13106