For every vehicle I have owned/worked on for others I use K&N air filters. Reuseable, better breathing for more HP and FE. I have noticed a difference on every vehicle some better than others. To may dismay K&N does not make a filter or FIPK intake system for the HCH2. They are how every looking to produce one in the future. They are looking for "donor" cars to design the filter. The will use the car for about a day and in return you will get a free K&N filter for your car. I would do it however you have to live in SoCal to be eligiable, plus thats too far for me to take my **** car for a free filter. I just figure it may benefit others who live in SoCal and everyone here at GH once the filter or system does come out. I do not believe they are going to make an intake FIPK for the hybrid but if they get enough requests for an intake for any vehicle they will make it. They have done this in ther past for other vehicles. Thanks!