Catalytic Converter / Frontpipe Gasket

1986 E30 320i

New member
I have replaced the head gasket. And now I'm suffering with noise escaping from the catalytic converter / frontpipe gasket. I have had a few exhaust repair shops take a look at it and I have even had it replaced twice (with non genuine parts).

Will using a genuine BMW gasket solve the problem of the gasket coming loose over a couple of days? (The bolts slowly come loose and let out the noise). The gasket that the exhaust shops are installing are pure metal - not like the gasket that came off the pipe in the first place. The original gasket is more of a "fibre".

Do I also need to use "lock-bolts" as BMW insists?

any help will be appreciated.
 
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