we can go federal on this if you want....this is just from a google search...direct off the EPA site about the CAA (clean air act)
Sec. 203. (a) The following acts and the causing thereof are
prohibited-....
(3)(A) for any person to remove or render inoperative any
device or element of design installed on or in a motor
vehicle or motor vehicle engine in compliance with regula-
tions under this title prior to its sale and delivery to the
ultimate purchaser, or for any person knowingly to remove or
render inoperative any such device or element of design
after such sale and delivery to the ultimate purchaser; or
(B) for any person to manufacture or sell, or offer to
sell, or install, any part or component intended for use
with, or as part of, any motor vehicle or motor vehicle
engine, where a principal effect of the part or component is
to bypass, defeat, or render inoperative any device or
element of design installed on or in a motor vehicle or
motor vehicle engine in compliance with regulations under
this title, and where the person knows or should know that
such part or component is being offered for sale or
installed for such use or put to such use;
so...installing something on a car that does not meet the standards for that model year is illegal..FEDERALLY...no matter the state....im sure i could dig further into this if you want....
Anthony