Vehicles today are not made like they were 30 years ago. When you talk about the components of the vehicles exhaust system it is not just a muffler and exhaust pipe like in the old days. Today you will find catalytic converters and oxygen sensors and resonators along with the standard muffler and exhaust pipe. Some people have never heard of a catalytic converter before and do not know what it does on their vehicle. Well, the catalytic converter actually helps the vehicle burn the gasoline more efficiently be superheating it before it leaves the exhaust system. The main reason for this is to help lower the emissions on the vehicle. Your 2001 - 2004 Chrysler PT Cruiser has a factory catalytic converter that help keep the vehicle so that it meets the federal emissions requirements. If it starts to go bad or get plugged up there isn’t much that can be done other than to replace the catalytic converter with a new one. The best match for your vehicle would be a new Eastern Catalytic Converter. This is a quality made catalytic converter that will give your PT Cruiser years of trouble free driving. Auto part buyers desire first-rate customer support when purchasing reliable auto parts for a car or truck. For our valued customers, we've established an always-online technical assistance call center to address your requests. If you spot a better price somewhere else, tell us - we always beat any legitimate auto part price.