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In PA it is not illegal to change your exhaust system from a stock one. It must still have a muffler or resonator on it for obvious emission reasons. You cannot have a cutout, bypass, or similar device in place on your exhaust system. To sum it up as long as the exhaust system passes inspection and it does not exceed the noise levels set forth by the commonwealth which run from (soft site) 82db @ 35mph or less to 86db @35mph or more, (hard site) 84db @ 35mph or less to 88db @ 35mph or more. Oh, soft site includes surfaces covered with grass or other ground cover; hard site includes concrete, asphalt, packed dirt, and gravel surfaces (just FYI)
Hope this helps
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