Al, I have a stock evo with a K & N drop in filter and a dynoflash. The car runs great, but of course, I am hoping to upgrade some parts in the near future...speed is addictive!!

Since it was flashed for 91 octane, is this the best fuel to run under all conditions? Would a splash of 100 octane have any adverse or positive affect on the cars power/performance? What about straight 100 octane?

Thanks in advance for answering my question.