I concur with Smitty and Bud.
I asked about this at the dealer when I bought mine (adding ABS) since it didn't have it. It is only a FACTORY option. Like they said, you would have to strip the bike down to the frame, new wiring harness, computer, pump, etc.
btsom: I agree with you about training your brain, but I on the fence with ABS. I like knowing how to brake properly without it, but I also have read in many article on ABS testing that occasionally a racer can brake better than ABS on a dry road. Wet roads: ABS wins hands down. If I ever get a new HD, I think I will go with ABS. I did try it on some rentals and it is impressive. I would be concerned about the system failing and riding, but I would try and get if fixed ASAP. Then again, I haven't heard about too many problems with the system. I think all the police HD's have ABS. I think in 2006 only the police had the option and in 2007 HD started to offer the Brembo ABS to the public (but I could be wrong). It would be nice if there was a easy way to add it...