Exhaust systems
Listen to the exhaust system when buying a vehicle. If the vehicle sounds noisier than unmodified vehicles of the same make and model, the exhaust system may have been altered. If in doubt, make inquiries. The system should be replaced with a quieter system when, for example:
the exhaust system has been replaced with an excessively loud system such as a sports system, or
the baffles have been altered or removed from the muffler so the vehicle is noisier.