Ive been searching, and ive come accross something interesting. Apparently this plug alters MKV / ROZ coding. MKV = Multiplicative map adjustment,
ROZ = Research octaine number.

So, in saying that, it would control more than ignition timeing.

Would it change mixture ect to a different map?

And being named ROZ coding, would a higher number setting correspond to a higher octane rating?

josh