[Kputz]

Car and Driver takes a stock car delivered by the manufacturer and Car and Driver tests the car, they don't allow the manufacturer to test his car. They are also pretty wize to the tricks and know what to look for in the way of trick set ups. They also have 30 million monthly subscribers who would like nothing better than to hear how Crysler tried to skew some results. Clout like that discourages cheating.
If nothing is proved, why would a manufacturer get involved? Somebody, after all, must finish last.