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Recently brought and fitted a used blitz nur spec exhaust and when it arrived I noticed when I picked it up there was a bitty rattle coming from inside the back box, i tried to shake it out and a fair amount of loose soot/carbon/cat debris dropped out. After getting as much out as possible I fitted it to the car and just assumed with a bit of spirited driving it would clear it out further, yet when you shake the exhaust on the car you can still hear bits rattling? You can't hear it at idle or when driving but just wondered firstly if this was fairly normal or if there was anything I could do to clear it out? Advice would be much appreciated. thanks in advance