To generate power, your Toyota Celica must consume fuel. Burning it creates noxious gases full of pollutants. Your factory exhaust removes them. This keeps you, your passengers, and the environment safer. It does this job in stages. Stage one, handled by your catalytic converter, is capturing, containing, and converting those toxins into a combo of carbon dioxide and water vapor. Stage two, handled by your exhaust manifold, is gas collection and transfer through an exhaust pipe. Stage three, your resonator and muffler handle. They move air properly through the system while minimizing engine noise. The last stage, your muffler's tail pipe handles. It disperses the cleaner exhaust fumes into the air, where they dissipate. When should I replace the exhaust parts in my Toyota Celica, and how often, you may ask? That depends on where you drive and how. Catalytic converters might last as many as 100,000 miles, but most mufflers and resonators last only 2 to 4 years. It's better to determine the answer by looking for signs of exhaust problems, beyond a lit Check Engine light. Such symptoms include weird exhaust pipe and muffler noises, the smell of rotten eggs, and even falling fuel economy. If you see any of them, run a thorough inspection to determine if your exhaust if the culprit. If it is, don't worry. You can buy the best replacement exhaust parts possible for your Toyota Celica right here at our online parts store: the genuine article, which are guaranteed compatible with your sports car right off the line for peace of mind. Order today!