Please ignore the passenger's camera work. I'll post a better video later.
WOT 1st, slow shift to 2nd to get the full BOV sound, then some part throttle at high (5-6k+ rpm).
The BOV is quiet below 3k rpm. Above that it starts to get loud. Over 4k it's loud and will turn heads. It's quieter at part throttle and low rpm overall. At high rpm it's much much louder. The sound in general is more mature, zero squeaks, and deeper. I could see it being polarizing if you're constantly on/off throttle over 4k rpm. I personally love it.