I've been thinking about the numbers myself. Along with the 178 pulley I installed the pulley saver kit from Needswings. I never saw any indication of the belt slipping with the Code3 but maybe it was. I've read on an otherwise stock motor the difference is 7 hp more or less. I'm not stock. For me the 178 has been a big step up in power. It's worth mentioning that I replaced the Code3 because it was falling apart. My decision was between replacing it with the Eurocharged pulley or a crank pulley.

Les