These pipes were quiet when I had the bike running. Happy to answer any questions. The item "Honda Cb750k Exhaust Muffler header pipe head gasket flange 75-82 cb750 1974" is in sale since Wednesday, April 24, 2019. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Exhausts & Exhaust Systems\Exhaust Systems".The seller is "gmman010" and is located in Eldred, Pennsylvania. This item can be shipped worldwide.