Bit of a stupid question here but i kinda need to know what size plug my 99 XC SP 500 takes. When i bought the sled the owner had lost the manual and i never got to see what size plug it takes. There are BR8ES's in it right now but i thought that kinda sounded a bit hot but i don't really know. I thought there would have been a sticker under the hood that told what size it is but i couldn't find it. Thnx for the help...