Well the exact rule is:
Quote:
F. Addition of spoilers, splitters, rear wings, bumper covers, valances, side skirts, and non-functional sccops/vents is allowed provided that either:
1. It is a production part which is standard or optional equipment of a US model of the vehicle.
2. It is listed in the vehicle manufacturer***8217;s US accessory catalog for that vehicle for normal highway use. This does not allow for parts sold through a manufacturer***8217;s performance catalog (e.g., Ford Racing, HPD, MazdaSpeed, Mopar Performance, Mugen, NISMO, SPT, TRD, etc).
So no it wouldn't be legal, and I'm not sure I would test it out. Maybe devise a way to disconnect it?