Hi all, im sure this has been asked before, but I couldn't find it in any searches so Im gonna throw it out there again. I have a 2006 15hp 4 stroke serial# 1b351432 that I would like to get a few more ponies out of. Ive heard that the 15 and 20 use the same powerhead and the only difference is the carb. Has any one made this conversion, and if so what part # is the new carb I would need.