Salam
http://environment.gov.pk/images/rules/SRO72KE2009vehicle.pdf
85 db is pretty high.Still ill check and if its greater ill remove it surely
And 7.5 metres is rly far.ITP waale db meter silencer me mand dete hen
so just to be safe i measured it rly close t9 the silencer.It was max 78 and 75db normal.ITP waalon ne toh yehi karba he.After just 1 to 2 metres the sound dampens and max was 65 db.