As above^^^ Running any sort of meth mixture is a completely different ball game to running petrol. As Sam said, near enough the entire fuel system has to be changed if you plan on running it for a lengthy period of time, the stock fuel lines can't take it, fpr, etc. You won't notice any real difference unless the car is mapped for it, running meth changes the air/fuel ratio regardless of what mixture you run, you could end up causing more damage than good. There's a hell of a lot more to know about fuel than just the octane rating! ;) Infact octane rating means shit, the MON rating is more important! When buying race fuels look at the MON rating ;)