There’s a fine line between exploiting holes in the rules and cheating.
NASCAR has a unique history of both. I think DW’s most well known was when his crew chief noticed that the rules defines the weight of a car at the beginning of the race, but made no mention of weight at the end. He outfitted the roll cage with a little door and filled the cage with led shot. This was at Bristol. During the parade lap, DW said “Tally Ho” on the radio, opened the door and dropped over 100 lbs of excess weight. Of course he won the race. Cheating? I don’t know. Smokey Yunich making a 9/10 scale race car, absolutely cheating.
Smokey was great! Inflating a basketball in the fuel tank to make it appear to only hold the allowed amount of fuel, then deflating it before the race? Brilliant!
Using large diameter fuel lines and snaking them all over the place to again cheat on fuel? Wonderful! But the 9/10 scale car was the ultimate! NASCAR was a lot of fun back then! I don’t even follow it anymore. The cars are virtually identical.