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Originally Posted by ChrisZang
I would be very surprised if you would still pass smog after installing a secondary cat bypass. You take 50% of your cats out of commission. I am sure Porsche put them there for a reason. You will not throw a CE light as the O2 sensors measure before and after the primary cats, but smog is measured after the secondary cats.
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I still have all my cats. Here in AZ, all they do during a smog inspection is to hook up to the OBDII port, see if there are any codes, and then they do a gas cap pressure test. No underside or topside inspection. I'm pretty sure that a car with bypassed secondary cats would pass.