REIFNITZ, AUSTRIA – Audi appears to be gearing up for a limited-production run of its red-hot TT Clubsport Quattro, first shown a year ago as a concept at the 2007 Wörthersee Tour. For this year’s enthusiast meet, the open-cockpit two-seater is being shown in production-ready garb, according to Audi has made mainly detail changes to the car, including a strip of LED daytime running lights under the headlamps, a larger windshield with thicker A-pillars, beefier rollover bars and revised mirrors and rear bumper.