I put the kit in when I changed to 21" wheel. I put up pictures after the install (1" drop"). Before that I didnt put any of the PVC that came with it in, and it gave a 2" drop, didnt ride it as I thought that it was way too low and looked like I could have put my fender into the headlight. I recommend the 1" drop (adding a piece of PVC). I'll try to find the thread with the pics.
heres link to thread.
http://www.hdforums.com/forum/touring-models/487706-new-wheels-and-front-end.html