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| Message: | I don't know about all those additives, but I'd make sure you drive the car hard with high revs for a bit immediately prior to your test, in order to get the cat hot. I failed CA smog once and had to be re-tested. On my mechanic's advice above, I passed the second time with no modifications to the car. '89 325ic 5spd '91 318is 5spd '07 335i coupe 6spd | ||||