^ I disagree, I say do it, I have a Lexus is300 that comes stock with HID's in a non projector housing and it's straight as long as it's aimed properly
those housings are designed for xenon bulbs by Lexus. Drop in kits for a halogen housing do not do the same thing. Example My GF had a EK civic and with the drop in you could see the light in the trees driving down my street lol







