Just recieved my new / used / stock mach & was wondering about passing smog here in California ?....made in Detroit with all stock - federal smog equiptment ......
You shouldn't need anything special as long as all the factory stuff is still installed. I'm pretty certain all the 1999+ Mustangs were 50 state legal from the factory. From memory, the last time Mustangs had separate 49 state and California versions was probably the late 80's.