A GMC exhaust system is made of multiple components that run on the underbelly of your car - making them vulnerable to harsh weather conditions and hard knocks on the road. For that reason, a tough winter that brings salt, moisture, dirt and extreme temperatures can be very rough on exhaust parts such as the muffler and pipe. Or, worn out brackets, hangers, clamps and heat shields might be knocked loose from road debris. As a result, it's vital to check your GMC exhaust system at least once a year for damage. Your car's engine system relies on the GMC exhaust system to move the waste exhaust material from engine to tailpipe. That 'exhaust material' is typically waste byproducts from the engine such as hydrocarbons, carbon dioxide, carbon monoxide and sulfur dioxide. In addition to regulating proper exhaust flow, a GMC exhaust system regulates silencing, and emission levels for your car. A damaged exhaust system will mean an overly loud engine, rough idle, poor gas mileage, smoke and odors - all reasons to take care of your exhaust parts. After all, a corroded exhaust system can be a hazard to you and others on the road. So make a point of visually inspecting your GMC exhaust system after a rough winter to assess the damage - then order the parts through car-stuff.com to replace any worn out parts.