I do not believe that catalytic converters (as used in exhaust systems) have a heat shield. They are simply porous blocks through which the exhaust gasses flow.
A heat shield is used to keep high exhaust system operating temperatures from radiating to the floor of the passenger compartment or other vehicle parts that should not be exposed to the high heat. If it is mounted above the catalytic converter it becomes the catalytic converter heat shield. There can be other heat shields through-out the exhaust system not just the converter. The converter or converters, (some vehicles are equipped with more than one) are the hottest part of the exhaust system. Generally heat shields are made of stamped aluminized steel. They are light weight and effective in shielding various parts or areas of the vehicle from the high exhaust operating temperatures. They are also prone to corrosion after a long period of service, they can rattle and make noise once they become rusted from their mounting areas. They should under no circumstances be discarded once deemed broken. Instead heat shields should be replaced as they are needed for above mentioned reasons.
It's attached to the catalytic converter, which is part of the exhaust system, to prevent grass fires in tall grass or fields. It's located under the car about midway between the front and rear wheels.
No, the catalytic converter is part of the exhaust system. The drive train is the engine, transmission, and differential.
Yes
Catalytic converter
Yes it is part of the emission systems.
It is the part of the exhaust system that is AFTER the catalytic converter.
It is part of the exhaust system.
That depends on the engine, whether you are buying a dealer part or a generic fit aftermarket part, and what your definition of expensive is. A quality catalytic converter is not cheap.
Yes, it is an intercal part of the emissions system.
Yes, and it is illegal to remove it.
It is part of the emmission system and is mounted in the exhaust pipe near the engine.