They won't ban non standard pipes, but now that they have new certification laws and noise laws regarding exhausts, they may at some stage in the distant future be required to be certified. Already, if they think you're too loud, they can force you to get them tested at a low volume vehicle certifier, who can then sell you a wee tag to rivet to your cans. Fortunately the hot rod guys have put a lot of effort into keeping the law realistic, and and such non standard cans are fine non certified till if they're a reasonable volume

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