that isn't a chip as such, it's just a resistor to play with the AFM signal and lean out the mixtures. And since our cars were actually tuned for 100RON jap fuel which we don't have, so we are stretching our mixtures already on the 40 degree Australian summer days. Another thing that points to it not being a chip is that they sell them from R33's which are fairly unchipable (well for under $800-1000 anyway).