Honestly, its not going to run TOO rich by letting the air into the atmosphere.
I mean it will slightly but not enough to really effect the motor. The problem is that the MAF measures all incoming air and if you release that air via a BOV of any type your not going to have the amount of air coming to the MAF that it thinks there will be. Doing this you will be running the risk of causing the dreaded eeeemmkay 4 CEL and generally driving like poo
I guess to answer your question splitting the air half recirc half atmosphere you have LESS of a chance of getting a CEL than running a normal BOV from what i can tell.
But do you really wanna run that risk when the car was made for a DV? Or are you just a ricer who likes to hear a WHHHHOOOOOOSHHH sound
Lee
