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Hey changing my mid pipe of the exhaust and I can't get the pipe off from the cat. Are there nuts on there because I'm about the angle grind the things off. They just seem to be rusted completely off l.
 

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Assume this is a 1.2/1.4 or lesser spec?

If so the cat/downpipe will usually have studs that go through the flange on the mid pipe with nuts on the other side...most likely the nuts will have rounded off.

If you angle grind them off you will then need to remove the remains of the studs from the downpipe and fit new ones or use bolts in their place so depending how confident you are you might want to take it to a garage (i.e so you're not left with a car in bits that you cant fix).
 
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