Missing Smog Pump

The risk of clogging is said to be higher with no AIR pump, though I expect burning oil or coolant, or running rich, would have a lot more impact than the missing AIR injection. I personally wouldn't worry about the missing pump, they're reasonably expensive, used ones aren't far from failing too, and my lack of one never caused any emissions testing problems (they do tailpipe test where I am). The cats would likely still be fully functional at 108k -- I also wouldn't remove them if everything is running fine because then you WILL fail testing if it comes to your town, it would be a violation of federal law - however unlikely you'd ever be prosecuted, and you may remove some residual resale value from the car (while possibly making it run less fine in the process as the SN95 computer doesn't always like changes unless it's tuned for them). If you did replace the H-pipe I'd still get one with cats - nice 3-way high-flow cats with no AIR requirement. They're cheap, good for the environment (and the driver as your exhaust won't stink of fuel), and will keep your car fully legal. No reason not to on a stock car.