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Like Oil_Pan_4 pointed out, there are no cheap solutions to this. However, if you tune to lambda=1 using a wide band O2 sensor, you are most of the way home for HC, CO and NOx. I still use an old Hawk tester with CO and HC measurements. You can occasionally find these used on Ebay for a few hundred USD. But, I think they are over kill for the DIY.
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