I am thinking about changing out my side mufflers and bypass muffler on my 2009 4S. Any recommendations on which catback system sounds the best from the manufacturers listed below? I appreciate your help.

Akrapovic, Borla S-type, Soul, or Fabspeed.

 

Lots of positive feedback with gundo/fister side mufflers + center bypass. The muffler setup is similar to PSE. As for center bypass, there’s not a whole lot of difference between brands. It’s straight piping.