The health of your exhaust system is a big part of your car's health, and can impact your health, too. There's more down there than just a muffler for reducing noise. All of the pipes work to funnel exhaust fumes, reduce noise, and neutralize dangerous pollutants. If the byproducts are not directed away from you and your passengers, then you can get very sick. Also, if your byproducts are not treated correctly, then you will harm the environment.
Avoid carbon monoxide poisoning, and avoid poisoning the environment.
Your muffler is the metal container with holes and chambers that reduce noises, but it also works with a resonator to do so. Come in if you're worried about any of these parts. There's also of course the tail pipe at the end of the car, which carries exhaust fumes away. Get professionals to examine your exhaust system for damages. You can also get Magnaflow, FlowMaster, Black Widow or Carven products installed for a top-quality exhaust system.
Get a great system professionally installed