Dealer could recommend a shop, but make sure you verify with others. I'd post a note in one of the regional forums on this board and ask for a recommendation. Where are you?
08 E90 | Jet Black / Black | 6MT
Mods: RAC RG63 w/ Pirelli Corsa 255F/285R | Akrapovic Evo Exhaust | OEM Blacklines
Winter Setup: OEM 18s w/ Nokian Hakkapeliita R 245/40-18