Muffler required. No muffler or exhaust system shall be equipped with a cutout, bypass or similar device (27150. Adequate Muffler Required). Model year 2013 and newer motorcycles are required to maintain their original federally-required emissions exhaust systems, or purchase and use only aftermarket equipment that includes a readily-visible EPA stamp that certifies federal emissions compliance. A first violation will be a fix-it ticket and fine. Subsequent offenses will result in fines of $100 to $250.