Exhausting Exhaust Advice!
The first and one of the most dangerous, problems with an exhaust system is a bad smell. When working, your muffler will funnel exhaust fumes outside and away from the vehicle. If there is a leak or other problem, those fumes could be stuck inside your car. This is the most dangerous problem because exhaust fumes can be fatal over time. If you smell anything out of place, make sure you bring it in to a mechanic as soon as possible.
A well-tuned exhaust system has a number of benefits, with one being better fuel economy. So, pay attention to how often you head over to the pump. More trips than usual could mean your vehicle has a problem. Another helpful way to tell is if you have a newer model that tracks fuel economy on the dash. This will help you monitor month-over-month performance and catch a problem before it becomes serious.
Louder than usual noises
Last but not least, the most obvious sign is a drastic change in the volume of your muffler. When working properly, the muffler should operate quietly in the background. When something goes wrong, it becomes a roaring monster.