Quote:
Originally Posted by rader1
More or less guessing. I've seen a few people pass sniffer tests and I've seen a few people not pass with just secondary cats. I guess in certain situations it will work but not others.
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Interesting. Perhaps driving distance to the testing centre has something to do with that.
I remember reading somewhere that some 7 series were equipped with catalytic "pre-heaters" to help initial emissions on startup. I haven't been able to find any kind of aftermarket "pre-heater" through searches so far though.
I'll have to look up an exhaust shop locally, maybe they'll have some more knowledge or have run into this setup before..