I am about to buy a 2003 cobra, the owner uses 110 oct only, but up were i am we only have 93 oct at most places and thats what i want to use, since im dd the car. What do i need to do to change from 110 to 93, do i need a dyno tune again? the car is a 2.2 kb and its on 19-20ib of boost. or can i just go from 110 to 93. thanks.