softtail2, the closest to you is American H-D near Ann Arbor. Sean is a good wrench and does a lot of dyno tuning. I had him do a couple of maps with the SERT and both ran very well. TerryC gives you good advice also. Bishops is a very good shop, (head porting and tuning). Good Luck.
Many years working for HD. Now has his own shop with state-of-the-art dyno room. Dedicated to his business. Huge amount of experience. Also rides and races HD. Respected by many. I don't think you can do any better than with Bill.
wkohn, have you had any tuning done at Cummings? Reason I ask is I rode there one day to inquire about some mapping and the person I spoke with left me with some trepidation. I've been looking for someone with an experience with Cummings. When the "old man" owned the place
(he still might but I think his son runs it now) they were I think, involved with Jay Springsteen (and his brother), and were into XR750's and such. Nice dealership but not sure how they are at EFI mapping.