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It has never been legal in the US to remove any emissions equipment on any vehicle that is to be driven on the street. Even if it is outside of the smog check window, it still can not be removed or tampered with.

No lol.. This is the EPA's whole argument.

You can't modify the factory emissions output to go below the required output.

People like the Diesel Brothers from the Discovery Channel settled for like $3 million USD with the EPA for selling and promoting emissions defeat devices like tunes and straight pipes.

Legal in what respect? It wouldn't be legal to drive it

So it's only legal to drive a catless car if it was manufactured that way 50 years ago?

Correct. Federal prohibits tampering with or disabling lavatory smoke detectors I mean emissions equipment.

The loophole is that it doesn’t apply if you never take it off private property.