Adding acetone increases the knock level of petrol and also has a intercooling effect due to its low boiling point so will improve any turbo car slightly.

However, this only works to a point and has the added side effect that if you use too much, it can rot plastic/rubber components such as injector nozzles and hoses.

As to the power increase claims you stated... LOL !!!!

yes there is a slight increase but its not an econmical way of getting more power.

Carefull you dont spill any on your paintwork too