Borla Catback vs. B&B Tri-Flo

After a few months of work I am finally able to afford a catback for my black '01 M5 beauty. I am interested in sound as well as performance and really like the quad pipe look. After a bit of research I have nailed it down to a Borla or a B&B. My main concern is decent sound throughout the powerband. Any opinions are appreciated. Thanks!

i have the borla on mine and have been very happy...It does not sound "ricey" like most..very mellow tone to it...good luck!