uhm... an SAFC has the Decel correction function to correct the airflow count when the BOV is vented. again, this only works on Hot-wire type cars. Karmann wont work.

Bumping your base FP wont help either, itll make it WORSE. the reason it stumbles and bucks when the bov vents is cuz of the lack of air, or excess of fuel... bumping the FP will accentuate this problem

the only real way to do this is to place the MAF after the bov, converting to VPC, or get an HKS SSQV. these stay closed during idle. so when you let off the throttle, the vaccum is at 22 in/hg, and will cause the BOV to vent, but the SSQV will shut as the vaccum reduces and engine returns to idle and the engine will catch it self and not die out... but it still doesnt keep the engine from running rich inbetween shifts. this of course is a problem when trying to reduce transient boost lag and will cause your plugs to foul up faster.

Karmann meters are the BOMB for stock systems, but are hacker-unfriendly. they precisely meter every unit of air, first hand. a hotwire or map sensor only knows how much air is coming in via correct calculations and tables preprogrammed into the ECU. anyhow, i wont get into this stuff right now...

basically venting is a bad idea unless you have the right equipment. and yes, it does sound cool... admit it, there's a little bit of ricer in all of us.