Audi S4 (C4) GTO Chirping Like a Bird! – 2.2L 5-Cylinder Turbo Engine Melody Acceleration & Sound Drag & Track by turboandstance - December 13, 2017July 30, 2020 This Audi S4 GTO could be considered as the Audi 90 IMSA GTO twin. Why? Because it's actually a 90 GTO with a different body na chassis. Let me explain.. After the 1989 IMSA championship Audi retired from the American competition and they shipped two of their Audi 200 Quattro TransAm