Is just another device to lean the timing out, its not so good for import cars like ours, as we already retarded the ECU by using 98ron instead of 100ron fuel.
There are millions of these type of products out there, just different shape & label.
DISCLAIMER: The above text is the personal opinion of the author and does not represent the indisputable truth. The author is not responsible for any deaths, injuries or mental illness caused by the above statments.