Who do you guys use in Houston for BMW service service and a tune?
I don't think that they do tuning, but for any work that I can't or don't want to do, I use Orion Auto Service in the Heights. For custom work you might want to talk to Garagisti on Hempstead Highway. I've never used them, but the owner is the same guy who custom built an e46 M3 Wagon, so for that reason alone he is my hero.
I used to take my German cars over to Cliff at Sports Car Repair near the Galleria when I lived there. Can't comment on tunes, but possible.
www.f2motors.com When I had my bodyshop, F2 was around the corner from me. Dairy Ashford & Memorial area.