What metal is the exhaust system made of?
Auto repair

What metal is the exhaust system made of?

09.11.2022 /

Exhaust systems must be made of metal to provide the required durability and resistance to heat, cold and the elements. However, there are many different types of metals (and grades of individual metals). There are also differences between stock exhaust systems and aftermarket systems.

stock exhaust

If you're still using the stock exhaust system that came with your car, chances are it's made from 400-series steel (usually 409, but other grades are also used). It is a type of carbon steel that provides good performance. It is relatively light, relatively strong, and relatively durable. Note the use of the word "relatively". Like all other components in production cars, exhaust systems are designed with compromises in an attempt to meet as many possible needs as possible.

Aftermarket exhaust

If you have had to replace your stock exhaust system due to damage or wear, you may already have an aftermarket system in place. It may use 400 series steel or something else, depending on the type of system in question.

  • Aluminized steel: Aluminized steel is an attempt to make the metal more resistant to corrosion. The aluminized coating oxidizes to protect the underlying metal (such as galvanized metal). However, any abrasion that removes this coating compromises the steel base and can lead to rust.

  • stainless steel: Several grades of stainless steel are used in aftermarket exhaust systems, especially in the muffler and tailpipes. Stainless steel provides some protection from weather and damage, but it also rusts over time.

  • Cast iron: Cast iron is used primarily in standard exhaust systems and is used to make the exhaust manifold that connects the engine to the pipeline. Cast iron is very strong, but very heavy. It also rusts over time and can become brittle.

  • Other metals: There are many other metals used in automotive exhaust systems, but they are usually used as alloys with steel or iron to improve corrosion resistance. These include chromium, nickel, manganese, copper and titanium.

A wide range of metals can be used in an exhaust system, depending on the type of system you have. However, they are all subject to damage and wear and need to be checked regularly and possibly replaced.

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