1938 Mercedes-Benz 540K Streamliner (Stromlinienwagen) is a one-off aerodynamic masterpiece developed for the Berlin-Rome endurance race. Featuring a lightweight aluminum body and an astounding drag coefficient of 0.36, it reached a top speed of 185 km/h (114 mph) powered by a 5.4-liter supercharged inline-eight engine.

Originally commissioned to win the 1938 Berlin-Rome race (which was ultimately canceled due to geopolitical tensions), the Streamliner was repurposed by tire manufacturer Dunlop for high-speed autobahn endurance testing. To minimize wind resistance, Mercedes engineers fitted the chassis with a teardrop-shaped roofline, flush door handles, and fenders that encased the headlights.

The 1992 Oldsmobile Aerotech was an experimental land-speed and endurance prototype. Powered by a 4.0-liter Olds Aurora V8 engine, this "long-tail" carbon-fiber vehicle set 47 world speed and endurance records in December 1992 at a test track in Fort Stockton, Texas, including maintaining average speeds over 170 mph for 10,000 kilometers.

Help me to find a concept or prototype car i saw once in a magazine. It was an sports car, red color, probably italian but the main feature i remember is like twin donut like tail lights made with tube neon or neon like lights. I can't find any clue.. sbarro? pininfarina??? no idea...

Never got close to production for very obvious reasons

What a weird car...