I don't know of any garages in the region, but check with mugami (MINI2 handle). He has done many performance mods and I believe is a distributor or reseller of MINI stuff (not too sure about reseller part).
Here's his MINI2 web page
http://www.mini2.com/forum/member.php?u=3125
I think he is owner of:
Cat & Dog Racing
N charleston, SC
843-224-1520
Trey R.
I hope I'm not revealing any secrets here...
