Rust is the number one enemy of gas exhaust systems, but it is by no means the only one. For example, touching the bottom of the bumps may cause physical damage to the parts of the car; Silencers may clog with internal parts coming off; and a defective oxygen sensor, a component that costs less than 100 euros on many vehicles, can destroy a 1,000-euro catalytic converter.
Despite the widespread use of aluminum alloy and stainless steel, for the exhaust system components over the last 20 years, rust is still one of the main causes of exhaust system problems, and not only in cold climates , where spreading salt on the road is common use. A hole or stones can do what rust does, by loosening parts of the exhaust system loose or creating holes in the muffler or other components.
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