Audi S4 B5 2.7L Bi Turbo 1998 1:18 scale Ott Omobile Diecast Model Car This Audi S4 B5 2.7L Bi Turbo (1998) diecast model car & features working wheels. It is made by Ott Omobile & is 1:18 scale (approx. 25cm / 9.8in long). limited edition of 2000 pieces worldwide.