This is a discussion on thinking about ordering Pypes O/R Xpipe within the 2005 - 2009 GT Tech forums, part of the 2005 - 2009 (S-197) Mustang category; I have the car tuned with Brenspeed files. Will I need to order new tune files if I install this ...
It would be a good idea to get a tune for a mid-pipe switch, yes. But I would advise against the offroad x. It is LOUD. I like loud but offroad x is just TOO loud. Get the pypes catted x, I love mine, same sound just toned down a bit.