Bought an extra DV... just in case---Update: old DV had a crack! - Page 2

Exactly how would a BOV work in conjunction with our DV? I thought a BOV replaces a DV... and since our A3's have a closed-loop system where the extra exhaust is needed to be reinserted into the engine, wouldn't a BOV release instead and cause problems?

Go to Eurocodetuning.com and look at the DV.   They have used a GReddy type BOV and adjusted it to work as a recirculating DV.
 
Cheers!