what do you mean by guide bearing/centering sleeve? do you mean the rubber isolator+bracket that the CSB is inside of, and which mounts the assembly to the car? How bad is it worn? That typically causes knocking/thumping under acceleration, but could also be bouncing around going over a bump. Did you notice any marks on the DS or tunnel around it that would be evidence of that?
Did you check your exhaust mounting points and heat shields?
Did you check your exhaust mounting points and heat shields?
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