I'm not a fan of the Grimmspeed. Has it been redesigned yet?

http://www.iwsti.com/forums/2-5-lite...os-review.html

I believe in Vent To Atmosphere... run the vent hose(s) under the car to the transmission or so and you should have minimal odour. However, your car may need a tune tweak to go VTA and idle smoothly.

Most of us are running the Cosworth baffle instead of the Killer B, especially with stock pans. Fair amount of labour involved in getting this done... are you planning for the engine rebuild?

http://www.rallysportdirect.com/Cosw...2-2011-WRX-STI

Edit: To be clear, the 2.0L oil pan design and stock baffling isn't the greatest. The Killer B windage tray, mounted that high, is still going to allow too much slosh and could uncover the oil pickup too easily. Plus, opinions on the design: http://forums.nasioc.com/forums/show...8&postcount=36

Whole thread: http://forums.nasioc.com/forums/show...1756427&page=2 Page 1 is mostly about pickups, not the pan. But you can see how the Cosworth baffle will help keep oil lower in the pan than the KillerB Windage Tray.