Hello, my 1993 245 non-turbo recently had its mufflers replaced. The shop welded the muffler pipe to the old, OEM catalytic converter pipe. Days later, the catalytic converter started rattling.

From what I've been told and read, the pipe at the back of the cat should be clamped to the exhaust pipe. Is this true? Other shops don't want to replace the cat because of this weld.

I bought the IPD cat and header pipe kit, to be sure the correct cat was used. Now I may have to install it myself, though I'm not very mechanical. The header pipe is just 3 bolts, but the weld is the problem. In your opinion, could I replace these parts, dealing with this weld?

Thanks.
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- FireFox31