Originally Posted by grey one

Forget the electric superchargers. They do not put out enough volume or boost to do any good. In fact they restrict air flow and can cause a loss of HP in mid to upper RPM ranges.

Ditto cold air intakes. They do produce some gain at wide open throttle, but little difference otherwise.

ECU re-flash seems to be the best bet, but mostly that is a HP vs RPM change.

If it were me, I would replace the air filter with a clean one, be sure I've got 0-40 oil in it and just enjoy the car.