Looking to change Head Pipes on my 2012..DO I have to retain my O2 sensors?? Are there big differences in all the different companies that offer them.. I did notice that the Supertrapp ones said something about having to change the air filter box.. Also, are the 2:2 power pipes better than the True Duals?? I emailed Vance and Hines to see if they have a new map for my Digital tuner, but no answer as of yet.. Thanks...