His question is in regards to cats not mufflers if I've read it correctly. If its mufflers he meant to ask about, Borla has the Stingers, XR-1, and not so much used Turbo mufflers. XR-1 being an aggressive sounding muffler. "S" or "Stinger" most commonly used on Mustangs.I have a choice between adding a true dual exhaust with Borla cats or flowmasters.
Which would you recommend?