The exhaust system ensures toxic fumes stay out of your car cabin and works to make your engine run correctly. It also helps give you the best possible fuel efficiency and cuts emissions that pollute the air. Because the process is loud, a muffler is used to cancel out the sound. However, the muffler not only reduces the noise level, but also controls the back pressure of the engine. If your cars muffler has a hole, then you can experience a carbon monoxide leak, so its important to fix it right away. Make sure you contact a professional exhaust shop or auto repair service, as a DIY muffler patch is never a good idea.