I see alot of references to intake modifications/carb. rejetting on earlier model RSTD including the "bigfoot" mod and jet kits, but I don't see anything for my 2008. Aren't there any jet kits etc. for the newer bike? Why? Also I see alot of references to resetting the pilot air screws on earlier models but not the later years. Any idea why? Where are the pilot air screw located on the carb? Any help will be appreciated.