I agree that it should be about tailpipe emissions. Unfortunately, we have two things going against us:
1. It goes without saying that the emissions systems of '70's and early '80's cars weren't great.
2. The Feds need some policy to follow, so they stick to the idea that outdated emissions gear are as important as the reason for the emissions equipment's existence.
Kirk Evans developed his system and wrote (in a nutshell) that it wasn't hard to engineer, but hard to get it thru the bureaucracy.
Sorry that I can't help solve the problem. Utah's vintage vehicle laws don't require emissions or inspection. Plus, it costs $10 per year to register.
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