Quote:
Originally Posted by rowsdower
Secondary cats are behind the postcat O2 sensors and will not affect your ability to pass a smog check assuming it is an OBDII test. If you were going to fail without secondaries, you will fail with them. Some states that require emissions inspections will let you pass with 1 Not Ready system so you could theoretically get through inspection without primaries, though I do not have experience trying to do that. I do not know CA's laws but if there was any state that would not allow any Not Readys, it's CA.
I have AA headers and the BPC N51 tune and there is something wrong that nobody seems to be able to figure out, and the car won't idle well. If I could do it over again I would skip the headers and go with just a tune, or leave it stock. AFAIK the Bimmerlabs tune is only for the N52 with aftermarket 3-stage manifold - it is not for the N51 so your options are BPC or AA.
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Choppy idle is hit or miss. Keep resetting the adaptations.