Audi's mid-engine sports car was supposed to make its debut at this year's 24 Hours of Le Mans, but at the last minute the unveiling was pushed off until this fall's Paris auto show. It's been worth the wait. The mid-engine, all-wheel-drive two-seater, previewed as the stunning Le Mans Quattro concept, is mechanically related to the Lamborghini Gallardo and will offer a choice of V-8 or V-10 powerplants when it debuts in mid-2007 (Europe.)