The exhaust is an essential component on your vehicle. It undergoes very strong thermal and mechanical stresses during its life. 
High temperatures and acidic exhaust fumes attack the internal wall of the exhaust system. External corrosion and rust can be caused by rain and dirt on the underside of your vehicle. It’s also common for older exhausts to come loose from their supports. This can happen over time simply due to vibrations caused by driving. 
It is important to have your exhaust checked regularly by a trained technician. Any damage to your exhaust could cause your emissions to increase, which would result in an MOT failure. 
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