The reason I picked up the 24's is the colder range, I just don't know how much colder of a plug they are. I work in a shop as an assistant auto tech, and talking to the tech I work under he told me that "the colder plug will take more temp to clean itself, too hot of a plug they tend to wear out by burn up, too cold the foul due to carbon buildup, so since your engine has considerably more air and fuel flowing through it, and is driven hard, a colder plug might be a good idea." Which I have noticed my plugs which are now 25's tend to get a little brunt up a little early for thier age. I think I will try the 24's for this cylce.
Thanks for the input everyone.