You cant have a nascar cheating thread without this...
As with most successful racers, Yunick was a master of the gray area straddling the rules. Perhaps his most famous exploit was his #13
1967 Chevrolet Chevelle, driven by
Curtis Turner. The car was so much faster than the competition during testing that they were certain that cheating was involved; some sort of
aerodynamic enhancement was strongly suspected, but the car's profile seemed to be entirely stock, as the rules required. It was eventually discovered that what Yunick had built was an exact 7/8 scale replica of the production car. Since then, NASCAR has required roofs, hoods, and trunks of cars to fit actual templates with the exact profile cut out of them.
Another Yunick innovation was getting around the regulations specifying a maximum size for the fuel tank, by using coils of eleven feet of two inch diameter tubing for the fuel line to add about 1.5 gallons to the car's fuel capacity. After suspicious NASCAR officials removed the tank for inspection, Yunick started the car with no gas tank and drove it back to the pits. Yunick also utilized such innovations as offset chassis, raised floors, roof spoilers, a balloon in the fuel tank which could be inflated when the car's fuel capacity was checked and deflated for the race, nitrous oxide injection, and other modifications often within the letter of the rulebook, if not the spirit. "All those other guys were cheatin' 10 times worse than us," Yunick wrote in his autobiography, "so it was just self-defense." Yunick's success was also due to his expertise in the aerodynamics of racing cars.
If you are younger and not a fanatic of nascar like Todd, Google this person and read about him. He was amazing.