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The only dual outlet mufflers available for X3 that bolt on is from Remus or Supersprint.. The Supersprint is much more expensive. The Remus comes with a template to cut the bumper. Then there is custom muffler possibilities as well. As far as sound, replacing only the catted downpipe will give you a lot more sound and performance. I have a catted performance downpipe but I wish I had the catless version as the cat seems to have burned out and does nothing anymore for emissions.
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