Puffer

Custom car owners can turn a switch on loud exhausts, police say they’re still illegal

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A valved exhaust for sale on the website of Valvetronic Designs, a U.S.-based retailer that sells systems that allow the driver to divert the exhaust away from the muffler 'at the touch of a button.' Car enthusiasts say they're a good option to make

Auto shops are selling valved exhaust systems that let drivers adjust muffler noise, but police say such systems remain illegal, even if they’re sold as stock equipment on new vehicles.