How do you replace a bad catalytic converter with

Instead of a dealer ... go to a small muffler shop (not some big national shop).

Big shops will want to add co$tly services.

Should be around $50 (they will keep your old cc . it contains platinum).

Direct fit after market converters are sold at most parts stores and the comon failing ones are in stock and the others can be ordered. Rember you get what you pay for and the cause of the failure needs to be found. or the newunit will fail. The dianoseses by check engine light codes can frequently be wrong as some of the sensers that report the failure can be bad theirselfs and a vacume leak injector failure or leak can make the sensers Lie and the code will be 420 cat ineffective. The problem is the cats ineffective not nessary to be bad. 420 code has many causes and many times its not the converter just the contitions arent right for it to work right.

You can use a universal and it would be a good idea to have a professional weld it on, unless you are an experienced welder. Most any shop will be able to assist you with welding it on but they might not cover the parts warranty, just there work.