Graeme replied:

About 3 years ago I had one of these fitted to my 80 series L/C, nd although the graph shoed an increase in power & torque, the difference was hardley noticeable. I also found no improvement in fuel consumption, and when I sold the vehicle I rang the Company and said I was not happy, and they removed it and gave a part refund.

I believe this can vary from make to make, but it did not work on my vehicle.

Graeme