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exhaust coughing at idle

  Fabia vrs tdi
it sounds like my rear exhaust can on my 182 coughs slightly when idleing but i dont think it does it on the left pipe

my o2 sensor pre-cat needs replaced and i need a new rear exhaust mount on the side that doesnt appear to cough, so not sure why my exhaust would be doing this.

oh and its a new exhaust only been fitted a week, apart from that the car is standard

help please