Correct answer
Exhaust system.
The catalyst, or catalytic converter, has become an essential element for treating the harmful gases that leave a vehicle through the exhaust pipe. The catalytic converter's role is to reduce the polluting elements contained in a vehicle's exhaust gases through the technique of catalysis, and it forms part of the exhaust system, positioned between the exhaust pipe and the manifold.
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Timing system.
Lubrication system.
Exhaust system.
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