Water injection has been used to clean the combustion chamber. I was looking at an Ionizer mister that creates a fog from water by ionization. I was wondering what it would do if you could pipe the fog into the air cleaner before the MAF sensor. It is 24 volts AC, so I would have to find something for 12 volts or get a DC/AC inverter. I am guessing that it will do as much good as driving on a rainy day.
ionizer fogger on ebay
ionizer fogger on ebay