I don't think I have seen even one that was CARB compliant.I don't know if they are CARB compliant but I've seen new D1 Y-pipes for sale on ebay for $400 shipped.
As long as they are CARB-approved, they are okay in the La-La-Land. The guys in the smog check shops actually drop on their knees and peek under to verify CA-compliance.I put a set of aftermarket converters on my 96. Got them from Atlantic British. No problems.