430 Replace Exhaust Manifold keep Cats

The cars have 2 pairs of cats. One set is embedded in the header pipes, often referred to as “pre-cats”. The second set is separate, downstream of the headers. I know of no aftermarket set of headers that have the embedded pre-cats. There are replacement headers with pre-cats made by Tubi, but they are the OEM supplier so not really aftermarket. Aftermarket headers without pre-cats are not California Air Resources Board (CARB) certified, so if you want to be legal, you have to go OEM or Tubi (OEM).


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im confused - plenty of members here in CA who run aftermarket exhaust, headers, and hiflow cats no?

ie if you take a stock car and install capristo headers and capristo 200 cel cats, it will pass SMOG in CA, is that incorrect?

 

Only if they are CARB certified. If cars with modified aftermarket cat exhausts are passing, it’s because the inspectors aren’t looking carefully or don’t know what the car came stock with, and testing is mostly about OBD II readiness monitors showing “ready”. While that probably happens a lot because stations might hardly ever see Ferraris, you could be ordered to put it all back or face a fine or worse.


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So in cali u can change the mufflers with aftermarket and thats it?


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Actually I think it depends on how loud the aftermarket mufflers are. Technically if they are loud like maybe a S line you are probably illegal. Ca is one of the worst states for enthusiasts.