the kit will drop in, but because of the need of a balast and ignitor for HID, you must have an external device. You could save the need to drill by baking your headlights and hoping there is enough space to put the balast and ignitor inside the headlight housing itself. But then again, the balast gets really hot so you might just end up melting the housing or causing a fire. It should be easy to get a dust cap if you need to. Subarugenuineparts has them for $12.71. When I did HID on my 2008 impreza I bought an extra set just in case I would have to revert back.