Here where I live we can only get 87 octane gas(regular), closest supreme is 100kms away. What are the results of running 87 octane in my 08 Ultra with stock exhaust? Will it make the engine run hotter?, I went for a 60km ride today and when I returned home, the head pipes inside the heat shields were blueish and yellow. They weren't like that before I left. But last week I went for a 200km ride on the same 87 octane and the blueing didn't happen. I have been adding octane boost when filling up but don't know how much the gas is being upgraded to.