To keep up the X-perimental nature of this group, I present the

Oldsmobile Aerotech
At the end of 1984, the development of Oldsmobile Quad 4 engine was beginning. It was an inline-4 engine incorporating four valves per cylinder and dual overhead camshafts, an innovative technology used on a four-cylinder engine at the time. Oldsmobile advertised the engine to be highly fuel efficient and powerful. The engine generated a maximum power output of 150 hp (112 kW) and 160 lb⋅ft (217 N⋅m) in its standard configuration, outclassing the four-cylinder engines developed by German automobile manufacturers BMW and Mercedes, even rivalling Honda’s 2.5-liter V6 engine.
By the end of 1986, the construction of the first car was completed; the car was tested by A. J. Foyt at the General Motors proving grounds at Mesa, Arizona. Foyt, who was initially skeptical about the car’s potential, admired the car’s capabilities as he managed to take the car to speeds up to 218 mph (351 km/h) on the test track. Foyt is said to have admired the car for its stability at high speeds.
After the successful runs at the General Motors proving grounds, the development team decided to put Welburn’s long-tail design to test as well. Construction of a second car in this specification had begun in late 1985. The second car was almost the same as the first but featured elongated rear bodywork tapering downwards and a different engine, departing from the original 2.3-liter single turbocharged Quad 4 engine built by Batten to a twin turbocharged 2.3-litre Quad 4 engine, built in collaboration with Fueling Engineering. The new engine proved to be even more capable than its predecessor and generated a maximum power output in excess of 1,000 hp (746 kW).
On August 26, 1987, the development team, in the presence of FIA officials, tested the two completed cars on the Fort Stockton test track. Initial tests with the short-tail version of the car resulted in an average speed of 250.919 mph (403.815 km/h), falling close behind the closed-course speed record set by the Mercedes CIII-IV development prototype. As the team went on to adjust the car’s aerodynamics, A. J. Foyt tested the second car (long-tail version). The long-tail version proved to be even more capable than its short-tail sibling and allowed Foyt to attain a top speed of 275 mph (443 km/h) at the flying mile after some practice runs.
The next day, Foyt set a new speed record with the long-tail version, averaging 267.399 mph (430.337 km/h) after flying-mile runs in both directions of the track. The runs made with the now improved short-tail version, shortly after, resulted in a new closed-course speed record of 257.123 mph (413.799 km/h), beating Mercedes’ record by a big margin.
Oldsmobile produced three versions of the original Aerotech to prove the capabilities of the company’s Quad 4 engine. Two cars were built with shorter rear body work and were called Short Tail versions (ST), and one was built with a longer rear body work and thus called the Long Tail (LT).
Subsequently, between December 7 and 15, 1992, another version of the Aerotech, this time powered by a 4.0-litre Oldsmobile Aurora V8 engine and now fitted with functional lights, broke 47 speed endurance records, including the 10,000- and 25,000-kilometre world speed records. Other national and international speed records ranging from 10 kilometres to 24 hours were accomplished by a team of drivers working 24 hours a day for 8 days. These records were also set at the Fort Stockton test track.