Exhaust systems capture the noxious byproducts created when engines burn fuel and release much cleaner gases into the air. In short, they help keep you, your passengers, and the environment safer. They even help muffle the process's noise.

Exhausts work in several stages. First, pollutants pass through catalytic converters, where metals such as platinum, rhodium, and palladium capture and contain the toxic molecules and separate them into oxygen and nitrogen. They hold the nitrogen and release the oxygen, burning up hydrocarbons and carbon monoxide at the same time. In the end, what they expel is basically water vapor and carbon dioxide.

Secondly, exhaust manifolds collect the gases, sending them through an exhaust pipe, while a resonator and a muffler limit noise and optimize airflow. The muffler's tail pipe then disperses the cleaner fumes into the air.

Unfortunately, no exhaust system lasts indefinitely. Luckily, if yours is going bad or it has failed, there are signs that'll tell you. Look for worsening fuel economy, peculiar noises coming from your exhaust pipe or muffler, a rotten-egg odor, and a lit Check Engine light. If you see any of these, do a full inspection to determine which, if any, of your exhaust parts is the problem. Otherwise, normally, catalytic converters last 100,000 miles and mufflers and resonators last 2 to 4 years.

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