It is against Federal law to make any changes to the exhaust system. There is a very heavy fine and possible imprisonment for violating this law. Furthermore it is illegal to sell a vehicle with tampered emission systems. So if you trade it in, at a dealer, on a new car, they will probably report the violation to the EPA.If you sell it to a private individual, they would be obligated, under the law, to report it. Also there would be no way the vehicle would pass inspection.By law I can’t help you tamper or modify the emission systems in any way.