True but not true. Even my cop buddy says it too. A cop should always carry around a noise meter like at a radioshack and check the decibel of the exhaust. If its over 92 or was it 95 thats illegal but below that your fine. Im not sure if all exhaust are illegal but Ill have to check since he has an exhaust too so Im sure not all exhaust is illegal. Maybe if you dont have a cat then its illegal.