I've been giving this some thought ,
and I'd like to see If you think Im right.
There would be no point in fitting a bov to a drawthrough turbo set up.
1, I'd have to loop the venting back into the air cleaner so there would be no cool noise.
2, because the throttle butterfly is on the intake side of the turbo,when a shift was made there would be vaccum between the turbo and the motor meaning no hinderence for the turbo to spool up against. Hence no need to vent.
3,If the valve was put between the turbo intake and the carb to let air in rather than out, to keep the turbo spinning when the carb is shut while shifting. When the valve was open othe than when driving fast the motor would getno gas and stall.
these are just a few Ideas that sprang to mind while I was at work(after I was offered a cheap bov). But If someone has done it, or thinks it will work I'm all ears.