Here's a handy one for a track car: If you run MAP-sensored load metering, you can get rid of the recirc' setup on OE GT-R and have them vent to atmosphere, and K&N happen to make some of those little 'breather filters' that have exactly the same ID circumference as the OD of the factory GT-R bov outlet ports (you'll need the filters so you don't suck crap into the engine while running in manifold vacuum)
Pro tip. Fully hektic PSSSCHTTTTTT!!!! noise, if you like that kinda thing...