i have the Turbosmart Kompact Series Dual Port BOV and i have had it on for about 7-8 months now. It did throw a DV code (diverter valve) on VAG COM at the last dyno day but nothing sinister has happened to the car yet...touch wood
the dual port (splitter) will send half the air back into the intake system (which is needed for our MAF sensor) and half out into the atmosphere, making the pssshhhhh noise. it has been said that this increases turbo lag but i am yet to experience this. you do run the risk of putting your car into limp mode cos of the lack of air being recirculated. this can be sorted by just turning the knob on top of the BOV to a harder setting.
full plumbback....well....it will keep your MAF sensor happy but you just won't get the "pssshhhhh" noise of the dual port.
whatever you do, don't buy a full atmosphere BOV, our cars do not accept them.....your car will definitely go into limp mode.
if i was to choose again i would go for a full plumbback BOV. the beauty of mine is that i have a screw-in plug to make it a full plumbback if anything bad happens.
Kai had the same as mine and had his car "shut down" (everything shut off - electrics, engine, lights) on the HWY. he just put the clutch it, turned it off, then back on again and it was fine
Blitzen (Ryan) has the Forge Dual Port, he'll be able to fill you in on that one.
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