Their exhaust is considered pretty much the worst in the BMW world :/ It's dyno-proven to provide the least hp gains on an E36 M3 of all the major aftermarket exhausts, and apparently their E46 M3 one doesn't fit very well and has smaller tips than the stock exhaust. Not a good rep they have on other forums...
I wonder what the Eclipse/Vette/NSX/etc. guys think about B&B... hmm...