hello all, i just got a new 2002 400 ex and i want to change some things about it. i am going to get a aftermarket oil cooler for it and some other stuff like a pipe and jet kit i was wondering wht would be the best spark plug to use someone told me to use a dp9ea. ( i think thats right) is this so and will it help lower the head temp thanks. alos any advice on mods will be helpfull.