If you look at the bends of the Brullen vs B&B, the Brullen's bends are less sharp and more smooth - which should allow for better flow. The B&B quad oval is probably the nicest looking, but the Brullen quad round is pretty sharp. I have Brullen w/ black mufflers and quad 3.5" tips. I love the look and the sound is deep and smooth, and not too loud.
Jack B 17.9 @ 57.21... Reality, the #1 weapon against Jack B.