One, its only cheating if you get caught. Secondly, most of the time its not a black and white situation, its a gray area that is not definied in the rules. The exception to this would be like Michael Waltrip's crew chief putting a industrial food lubricant inside the intake, that is pretty clearly messing with the performance of the approved intake. You have to push the envelope of figuring out how things work, and what makes your car better. Otherwise you become a stroker, IE: Kenny Wallace.