Rollie is in Conyers, not exactly close but he has a couple sweet Vmax's. He has the Kerker 4 into 1 which is the best sounding 4 into 1 IMO, but I've heard the Hindle produces the most power.
For 4 into 2 exhausts I would rate the Dale Walker the best looking, and Marks the best sounding. The UFo is a well built setup but is too raspy for my tastes, I rather like Mark's deep throaty sound but some say I am biased.
In fact, I had my Marks sound checked against several other exhausts and it was tied with a UFO 4 into 1 @ 116 db each. The owner of the UFO exhaust was not happy!:rofl_200:To each their own, listening to them in person is the only way to tell the sound that you like best. Look for events in your area, such as the one that is coming up at the Tail of the Dragon, which is not to far from you.