Showcasing new technology is what the American Le Mans Series (or "Le Mans" itself) is for. You start changing NASCAR from what it is into what another racing series is, and it will be a ghost of itself in no time.

To successfully change itself into a series that ran new technology among different manufacturers, NASCAR would have to implement equivalency formulas such as the do in ALMS/Le Mans, things such as different air intake restrictions, different rev-limits, and different fuel capacities between the manufacturers. NASCAR fans squealed bloody murder back when NASCAR would have such small differences between manufacturers as a quarter of an inch on the front air dams.

Try telling the Dale Earnhardt, Jr. fans that his Chevy has to have a smaller restrictor plate and 2 less gallons of fuel than Carl Edwards Ford. HAHA