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...
monsta 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. To the best of my knowledge, YES you do need a retune. The rear o2 sensors need to be turned off. Link to comment Share on other sites More sharing options...
lawdude Posted February 27, 2011 Report Share Posted February 27, 2011 I thought they only had to be turned off if you were catless. Link to comment Share on other sites More sharing options...
monsta Posted February 27, 2011 Report Share Posted February 27, 2011 I thought they only had to be turned off if you were catless. Yep, my mistake, read the post wrong! Link to comment Share on other sites More sharing options...
SVTSnake Posted February 28, 2011 Report Share Posted February 28, 2011 No tune required if it has cats....you are good!! Link to comment Share on other sites More sharing options...
BLUE 2010 SHELBY GT 500 Posted February 28, 2011 Report Share Posted February 28, 2011 i did my lethal mid pipe with high flow cats AFTER i did the pulley and tune and these NO retune required Link to comment Share on other sites More sharing options...
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