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25508-74110 - $367.69 - Cataltyic converter, front
25576-74030 - $9.68 - gasket, converter to discharge elbow
90917-06056 - $6.84 - gasket, converter to B-pipe
17410-7A050 - $733.97 - B-pipe including secondary converter
90917-06049 - $4.85 - gasket, B-pipe to muffler
11322-88380 - $64.78 - Upper timing belt cover
11329-88380 - $9.54 - Gasket, upper timing belt cover
90105-06035 - $0.91 - Bolt, timing belt cover, long (x2 = $1.82)
91511-G0620 - $0.49 - Bolt, timing belt cover, short (x2 = $0.98)
What exactly was over the limit? Cats primarily control hydrocarbon emissions. There are a number of tricks that should be followed to optimize the efficiency of the emissions control system. Was the car totally warmed up (recently driven under load to put sufficient heat into the cat), ignition timing set correctly, air filter clean, etc?
A timing belt cover is not an emissions component and should not result in failure in a California smog test. Adjustable cam pulleys are illegal in CA, but that's a different issue. I suspect the smog tech was simply pointing out a missing part rather than failing your car based on that missing part. If he specifically said otherwise, it might be time to ask some more questions and see whether he really knows what he's talking about, or just looking for ways to make extra money off you. If he's just BSing you, you might be able to find a more knowledgable, more MR2-friendly smog shop where they actually know how our cars work and what makes them run clean.
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