whether any car passes, there's a lot to consider. But yes I believe it can be on a car and pass. It might be closer to not passing, but I'm sure it can pass. An ECV can help the scavenging at low loads which the emissions test is done at. Things before the CAT like Intakes
and headers (in general, yes we have one header) play a bigger role in emissions as well as where your engine is running as far as A/F ratios which you can't adjust with the stock ecu alone.
Now the kazuma obviously won't pass a noise level test, but that is not done during your smog test.