If you own an older car then you may have to replace part or all of the exhaust at some point. The exhaust system is vital to the car running as it should and getting rid of the harmful gases that are produced by the engine.
The exhaust is usually in three sections, back box, centre and front. Often it will only be one part that will need to be replaced and the most common part is the back box. If your car starts to sound particularly loud then it may be that you have a hole in the exhaust system. You may be able to repair the exhaust using exhaust tape or bandage but this should only be a temporary fix and you should look at getting the part replaced as soon as you can.
If you are concerned about the performance your exhaust or catalytic converter then many garages offer a free check of the system and will report any faults they find to you.