muffler modify problem with police

hi there, days ago police gave me a violation about my old plate number he told me, i need to change it in 2 days then report to traffic department after changing and also my there any permit or is it legal to qatar to modify muffler of our car? because I bought my car 3months ago and i think the first owner change it, I just wondering if he change the muffler so how he get the estimatara if not allowed?

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