Guys, I've got a question about Kohlers.. what is the difference between the 22hp and the 25?? I think I've heard here that the only difference between these two is the carb. Is this true? the engine is a 00' or 01' model with the air filter that faces up. (Small diameter filter, with foam wrap, that recieves air from two ducts in the blower housing, supposedly the better filter) I'd really like to get more power out of this machine without resorting to hot rod tactics, or an engine swap. The doubles made this machine a lot better, but they are really sapping some hp just to turn them. Thanks Btw, I did turn up the rpm's when I got it.. It just needs more hp.