Spanky: I'm not saying no. Just pointing out possible unintended consequences. Yes, someone could use a Shelby engine in a Charger today, but with a VIN tag, it would be a blatant misrepresentation.

I like the idea of being able to use a plenty available shell as opposed to a rare one, just for the VIN tags.
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But even with a VIN rule, isn't that still a blatant misrepresentation? If the two cars are identical except for bolt on bits, then the only way to check, even with a VIN rule, is to look at whether the car has the 34-inch modulator on the dipthong or has a 28-inch modulator on the dipthong.

Either way, it's going to be easier to see if you've got clearly illegal parts, such as overly large brakes, then it will be see the VIN... primarily because anyone running a Model Q as a Model N won't let you get close enough to the car to check the VIN.