It s illegal to remove a catalytic converter.
YES IT WILL
No, but it will make a sucking type sound.
Plugged catalytic converter
Check the heat shield on the catalytic converter Check exhaust hangers
Yes, it sure can.
Heat shields often corrode and become loose but they usually cause a tinny rattling sound. Eventually they fall off as witnessed by the dozens of them found along highways. Mechanics often remove them (with your permission) if they are loose, because they serve no purpose other than to protect the technician from a very hot catalytic converter that he/she knows not to touch anyway. A "knocking" sound, however, is more likely caused by a worn or broken exhaust hanger, allowing the exhaust system to bump the underside of the vehicle. Be sure the engine isn't causing the knocking sound, driving around a car with a knocking sound in the engine can cause MAJOR damage. Knocking from your undercarriage can also be caused by suspension components that have gone bad or are leaking fluid.
bits of the catacomb that makes up your coverter have fallin losse. if it sound like there is dirt in it that that's the case. The catalytic converter needs replaced.
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
Yes, loose converter bolts sound a lot like a failed rod bearing.
Depending on what kind of "whirring" sound you are referring to, it can either be your catalytic converter or some problem with the exhaust system. Most likely the catalytic converter if its what I'm thinking of.
Yes, it can and this may also be a loose or cracked converter heat shield.