Not sure what an aircharger is (never heard of that model) but if you replace the stock paper filter with a OEM style K&N filtercharger then it will be 100% legal under Magnusson Moss Act on replacement parts. If you switch to a cone style filter then some states may rule it illegal (like Cali).
_________________________
Regards,
Chew
2007 Sly Silver Pontiac Solstice GXP