Right, which is why I mentioned braking. Aside from repeated hard braking like on a course, I think a street car may not need one, tho having one wouldn't hurt.
The other difference between auto and manual is that not only are you lifting between shifts, you're most likely accelerating hard too. So with an auto, accelerating hard and not lifting, any excess boost is handled by the wastegate, so again, a BOV may not be necessary.
I have a line on an turbo engine and auto tranny, but I like manuals and I WANT the BOV sound!
Owen