Yeah... they actually seem to facilitate it with their harnesses... they have it to where you have your high and low beams on simultaneously, the drive light is already in a projector housing, and there are empty slots in the relay panel. Wouldn't be difficult to do, at all.
Or switch to LED's it's a straight plug into the existing harness, no mods, no wiring and no heat issues and a lot less money.
I converted three of my Shakers it was some of the best money I ever spent.
DO NOT BUY OFF EBAY. Go to vleds.com and you can get quality LED's there, not junk. LED's are great. You can get HID's at HIDKITwarehouse.com , I've had good luck with them. High quality stuff. eBay you're asking for trouble. Get 5k or below. Anything more it will be blueish and look like crap, and attract negative attention.