Yep, and some techs are clueless in a good way, others in a bad way. I got failed once for aftermarket diverter valves on my B5 S4, even those those really have nothing to do with emissions. He claimed they were blowoff valves and failed me. He had no idea what a diverter valve was. Another time the tech luckily just missed the massive AWE MAF on my stage 3 car and passed. :)
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