Here in California, 2000 and newer cars get the OBD test and gas cap, plus a visual inspection. For anything older, there's a few more things like a sniffer up the tailpipe.
However, depending on the smog inspector, the level of visual inspection sort of varies. For example, if I take my wife's bone-stock Honda CRV in, the guy doesn't bother to open the hood or look under the car. Very unlikely that a CRV would be modified. But, if I take a car in that visually looks like it could be modified, like a Mustang that sounds louder than stock and looks like it's had stuff done to it, he'll take note and poke around under the hood a bit and may check for cats.
Honestly, there are so few Fiesta STs running around that my guy might look at it and not blink an eye, since it doesn't look all that different from the rest of the cars that roll through his shop every day. My car is visually stock other than wheels, which are Ford 15-spokes. Probably won't open the hood on it. But, you never know. If I'm the guy he decides to scrutinize for some reason, and maybe if he knows what to look for on a FIST, I don't want to raise his eyebrows.
Unlikely - his business model is that if he has to take more than five minutes with anyone, he's wasting time. He doesn't touch anything older than 2000, turns away anything he thinks will be a problem before it rolls into his shop.
I never went back to the guy who pulled out the mirrors and poked around my "Where did your cats go" Mustang!