Sunder as I posted above.. tween 85 and 95 get sniffed. If it passes you get a sticker.
Before 85 no sniffer and only a casual inspection of the lights, horn, wiper blades and gas cap if it is a sealed type.
After 95 the computer is plugged into and the codes are checked with their computer.
This is only for 2 Countys Around us here. The nearest county line is bout 7 or 8 miles from here. Some locals have domiciles in those "other counties". No sniffers or computer checks there.
As far as I know there are no rules (laws?) about changing engines or upgrading between years. The inspector would not know the difference anyway.
Our inspectors have little fervor where the inspectins are concerned. Many just do inspections and have no mechanic available to them. So it is simply pass or fail and if it is fail come back later and we will test you again.
The place I use installs window tint and does inspections. The only thing I have ever failed was one of the two back license plate lights. I went out and gave it a swift kick which reseated the ground and passed on the spot. <img src="/forums/images/graemlins/smile.gif" alt="" />
Big Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />