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Exhaust loud at low revs quiet at high



  bmw m3, clio sport
Hi all, I have recently fitted a yozzasport race exhaust on my 172. The problem I have is it sounds loud and nice at low revs under 3k, but when you put your foot down and go over 3k it sounds stock. It isn't decatted, any ideas what could be the cause or problem, could a duff cat cause bad sound?
 
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