You’ll never see a New York taxicab do something like this.
Quick Update: Uh oh! It appears the company that provides the Ring-Taxi service and owns the name/rights is no longer offering the BMW Ring-Taxi service this year. I think it has to do with the E60 M5 no longer in production and the F10 M5 still not released yet. Anyways, head over to Bridge to Gantry for more details.