I meet this decision with mixed emotions. On one hand I can see the regulations for safety but on the other hand it's going to be like the Crown IROC series (identical cars, engines,etc..BORING) leaving it all to driver ability -at least in the "perfect world". Too many regulations are going to have mfgrs going elsewhere. They should have a base like "x" amount of cylinders, and a basic base and let mfgrs do their own engine developement. That keeps a competitive spirit to "keep up with the Jones" attitude. Take away the competitive spirit, you might as well be racing kites. I know they're trying to keep costs down to attract more competitors & make it affordable for smaller teams to get involved, but the high end guys have bottomless wallets and there's NO WAY IN HELL you're going to tell them how much they can spend.