Single outlet is for people who don't wanna fill up the cutout in the bumper
I have a factory GM resonator...and its quiet. I also have chambered flowmasters...and they are the best sounding flowmasters I have ever heard on a 3800. Ever. Its all in the setup...because most chambered mufflers, as stated...sound like crap.
I don't like Magnaflow's on these cars because they sound too tame. I'd suggest something like a Corsa or Dynomax muffler. I love the Corsa catback on these cars...and I've only heard one...and he had headers and a VS cam.
