Okay my 2004 STI owners manual is printed differently. I would take a photo or something but NICK and Subie Gal get upset with me placing CLASSIFIED material on the site so I better not. I would ask them for permission but they do not recieve messgaes just send them. Like a one way valve. Anyway I like the design of the STI oil pan and agree with you that swinging trap doors is not a good idea for control.