Ive got an Jap spec Subaru sti9, and it had to be re-mapped, cos it was mapped to run on 100ron fuel, which is what they have in Japan!!!
I was warned not use anything apart from optimax, for risk of detonation if driven hard. If I had no choice due to lack of a shell garage, then I could use a lower grade, but keep it below5000rpm.
I have been putting it in my 999R, and it has definatly made it smoother, as she was a bit sluggish untill she got going!!
Just my 2 pennies worth guys!!
