It does Stand for Boost Performance Motorsports....not sure why the link doesn't work..I will let the guys know about that..
I personally have BPM exhausts on both of my Subby's and love the sound and they don't drone too bad on the highway. They are TRUE 3" with no tapering at all. I really don't think sound clips do these exhaust justice..they also come with a life time rust warranty and a 1 year no questions asked return warranty. Plus all the BPM package deals (including the one with the Cobb AP) are also 20% off with the coupon code.
Good times for all
-Nick