1990 IMSA GTO + GTU at Mid Ohio

Arguably the best days of IMSA GTO and GTU diversity and competition were found in 1990 and the series' visit to Mid-Ohio offered proof of the dynamic cars and drivers in play.
In GTO, Mazda's 4-rotor RX-7s fought with Nissan's twin-turbo V6 300ZXs which fought with turbo inline-4 Mercury Cougars, and in one of its rare appearances, the Ferrari France F40 turbo V8 was super fast.
In GTU, it was Nissan vs Dodge vs Porsche and more.
Nothing but great manufacturer battles in cars made by hand by most teams--a different era than today's IMSA where all the GT machinery starts on the production line. Upscaled to HD specs (1920x1080).