Yes it could be a problem. Any aftermarket parts that are engine related MUST be C.A.R.B. exempt. I was warned that I could have had to remove my Top Speed exhaust when it came time to smog my car.
Luckily most smog shops don't know much about Porsches and overlook the inspection and just hook up the mic and as long as the measurements come out fine then it's o.k.
My last smog shop had a technician get look under the car with a mirror.........you just have to do your research and talk to people in LA that have had their cars smogged in the region.
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house
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