In time, the moment will inevitably come, when individual pipes and silencers corrode and become unfit for further use. Let us note, that the last silencer is most often damaged first. It happens so, because water vapor condenses in it, contained in the exhaust gas, and the significantly cooled exhaust gases flowing through it are not able to dry it. Other vulnerable parts of the exhaust systems are the aforementioned flexible connectors and the connection points of the individual parts. In the workshop practice, we can observe the following regularity: the first damage is to the rear silencer, which can be replaced with a new one. When it is damaged, it is damaged a second time, essentially the entire exhaust system is replaceable. And so it should be done, because partially corroded pipes or silencers are difficult to recover and usually do not pay off.
The question arises, whether the replaced exhaust system will have the same durability as the one supplied with the new car? Usually not. Why is this happening? Here the problem is of a marketing nature. As it turns out, Original (used on the vehicle's original equipment) exhaust system parts would be priced hard for buyers to accept, owners of used cars of little value.
There are many suppliers of a full range of exhaust systems on the aftermarket, however, be aware, that the parts they produce are manufactured to lower standards than the original parts. This is usually not related to noise attenuation or an effect on engine performance – these parameters are usually the same and approved by the car manufacturer. However, the materials and anti-corrosion coatings are slightly different, So the exhaust system from companies such as Bosal or Walker is likely to last much shorter than the original system. Therefore, you should take care
o proper assembly and proper operation of the new or replaced exhaust system. Although the assembly of these parts does not require extraordinary workshop knowledge, however, accuracy and experience are needed, to avoid unfavorable pre-stressing of the whole, hangers tension too much, etc..