Audi 90 quattro

The Audi 90 quattro IMSA GTO was a specialized version of the quattro intended for racing in the IMSA GT Championship. Entered into the 1989 IMSA GT Championship by Audi of America and driven by Hans-Joachim Stuck, the quattro GTO was essentially a standard Group B Audi quattro with a silhouette bodyshell and an all-wheel drive drivetrain. The cars 2.2L R5 turbocharged flat-5 could produce 720 horsepower and was very successful, winning seven of thirteen races; despite this, Audi lost the championship to Roush Racing that year. Audi would pull out of the GTO class the next year, instead opting to use their V8 in the DTM with similar levels of success. The quattro GTO has since become one of the most iconic and revered IMSA cars of all time. This casting features hidden engine detail when taken apart.