this is kinda weird we ran a fat boy on a few older bike with stock heads and two peice heads and never had this problem if you are worried about it being to close dont be as many other bikes such as our a/c elite bike has the pipe write next to the plug so i dont think its a problem how ever wen we ran our fat boy we insulated the pipe as it was close to the plug and lead and we found no power gain but wen the bike got hot it did not brake down it still ran smooth hope any of this help's
