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Raspy noise coming from cat or centre box



  RB 182 cup,astra sri
Car was in to have the cat sorted. The clips connecting the cat to the manifold were broken so new ones put on. Now there is what can only be described as a kind of raspy noise coming from that area on hard acceleration. Can't really hear it when revving when stationary. Don't know if it's just the noise of my exhaust now that it's fully sealed where there was a leak before. Or whether there might be something wrong with the cat or centre section.

The exhaust is a full custom system. Don't know what else it can be as the guy checked out he system when it was in to make sure there were no leaks on the rest of the system he installed.

Any ideas? Otherwise I guess I will just have to take it back in.
 


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