I believe they scan it when they smog test it, but I'll see if I can get my code OBDII code reader to pick anything up.
The internals of the engine are stock, however I found a receipt for $300 for a "performance tune" and a 160 degree t-stat that the original owner (apparently) put in it some years ago. I'm guessing it was some sort of PCM flash tune.
Since the internals and everything else are stock, I'm thinking to replace the 160 degree stat and return to stock tune (or a canned "stock type tune" from PCM for Less).
I will check the sensors as best I can and see about getting the injectors flow tested.
The exhaust doesn't really smell when it's warmed up, however when it's cold, there's that "the catalytic coverters are working hard smell (like catalyzed fuel). Not a burn smell or gas smell.... The exhaust seems to flow very well and the cats don't seem to get too (burning) hot. Based on the measurements from the smog check, I'd say the cats are working very well.
I have the two on the left exhaust, so I'm pretty sure I'd notice a change in tone if there was a restriction of some kind. It's got a great exhaust note.
One of my thoughts is that the car isn't getting hot enough to go from closed to open loop (sensing from the O2 sensors) and it's just running off the fuel map. Not sure if that makes any sense, but I've read that somewhere on here and on a tuners website. ---> here LT1 PCM Tuning - Tips & Tricks for DIY Tuning!
Thanks for the info. With fuel at $4.40 a gallon here and my truck getting 10mpg with a tailwind...I'm looking to the old Camaro for some savings.