If the catalytic converter is defective more than likely the O2 sensor is defective.
No, replace the converter with a new one. Anything else is illegal.
Depends on what the smell is and what is causing it. Have the catalytic converter tested before you spend the money to replace it. It maybe something else causing this problem.
A new catalytic converter will help to reduce your car's emissions, you can also take your car to a local garage and have them perform tests on it to see how else emissions can be reduced
A quality aftermarket catalytic converter will work fine as long as everything else is in good working order.
No
Any muffler shop can replace and cheaper than anywhere else
Code p0304 is a cylinder #3 misfire.
The install is the same as a muffler. A muffler shop can do it cheaper than anyone else.
The knocking noise in or around the catalytic converter comes because something is broken. It could be a pipe or a strap or something else. Fix it before you leave your exhaust pipe on the road.
It shouldn't make any difference except that you should now make fewer exhaust hydrocarbon emissions. It isn't the Cat Converter, look somewhere else. Connect a code reader to find out what problem codes are stored in the computer.
Excellent question. I don't have the answer, but perhaps someone else will. Had same difficulty. Wound up cutting the pig tail & splicing!
I have replaced hub bearings like 4 times on my 01 grand prix, anyone else have that problem and the catalytic converter 3 x