dffej51 Posted February 27, 2011 Report Share Posted February 27, 2011 After inquiring on this forum about after market x-pipes I have decided to go with the Lethal Performance High Flow Catted x-pipe. Someone in my local Mustang club said changing to this x-pipe requires a retune but I don't agree. Can anyone clarify for me? Thanks. Link to comment Share on other sites More sharing options...
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