We don't have yearly emissions tests here. Basically, if an authority thinks your car is too loud / smells like rotton eggs (when full catless) they can give you a yellow defect sticker (we call them a 'canary'). You then need to pass a sniffer / sound test to make sure they are within the limits.
Reality is, don't go WOT infront of one and turn off the engine if you are pulled over so they can't smell anything.
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