I have an 83SC, I have a cat by-pass.My mechanic assures me that my car would pass a calif. smog test w/o cat.He uses a exaust gas analizer to adjust my car.He can control the settings,like, if you did have high NOx.
he could lower it just for the test,then raise it back to what your engine likes after the test.That would be alot easier than swapping out the by-pass just for the test.You can get the numbers needed to pass,
have your car checked by your mechanic and see ahead of time to make sure.
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