Had this on my Gen 3, was only installed for 6 months . It does NOT add any HP at all. Because of the Atkinson motor in the Prius, the cold air does nothing for performance or fuel efficiency. When installed, it opens up the engine bay from all the stock intake plastic. The installed pic is not from my car, it is to show what the finished install will look like. Installation instructions can be downloaded from the Injen website: http://www.injen.com/galleries/products/SP2090Update3-14-2013.pdf. No CARB sticker. Does not throw any codes. Local sale preferred, So Cal (Orange County) 2016 Prius 4 Touring
