Originally Posted by
oorx7
FYI. I live in Illinois and cars older than OBD2 (<1996) are emisions exept. So if the cat is bad, is it really necessary to buy a factory new one?
Not needed for proper operation of the car. And as there's no O2 sensors after the cat the car won't know if you do or don't have a cat.
My truck actually passed emissions better without a cat. Was a good bit less restricted with the cat out of the way. So the better emissions output can really only be attributed to a better running engine due to less restriction in the exhaust.
Do you car what comes out of the tailpipe? That's the only reason for you to have a cat in the car if it's emission exempt. A properly running car doesn't put out much in the way of bad emissions anyways.
Get the valve clearances adjusted (will probably effect the ticking by ding that) and keep the car in proper tune and don't worry about a lack of cat IMO.
Cosmos Black/Black 1995 540iA M-Sport
BMW Individual Exclusive Edition, 1 of 65 total, 9/25/95 Build
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