Code of Federal Regulations Title 40. Protection of Environment § 40.205.173–2 Tampering

The manufacturer must include the following statement pursuant to § 205.173–4 with each product of that category the manufacturer distributes into commerce:

Tampering Prohibition

Federal law prohibits any modification to this exhaust system which causes the motorcycle to exceed the Federal noise standard. Use of the motorcycle with such a modified exhaust system is also prohibited.

Acts likely to constitute tampering include removal or puncturing the muffler, baffles, header pipes, or any other component which conducts exhaust gases.