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There is no runability difference between all of the cams on the market. None of them lope or do anything weird like that. They all start up like stock, idle like stock, run smoothly like stock. Literally the only difference is at what rpm range they add or subtract power. I never use 501’s in a 50-07 bike as it will KILL the power under 4500 in exchange for a modest gain between 5000-6000 rpms. Whereas the 413 cam has HUGE gains from 3000-4000 rpms, sometimes 20ft/lbs or more than the 501. And right smack in the middle of the rpm range where it is usable. This statement only applies to the 2002-2007 engines.