I have decided to make this post to help others who are intersted in this since I found several posts with conflicting or bad information.
The STi oil pan was installed to allow fitment of the APS Equal Length Header. I do not know if the STi pan has better baffling to prevent oil starvation or not.
Updated with part numbers and more pictures. If anyone has pictures of the inside of a STi Oil pan it would be appreciated. We did not get pictures at that stage for some reason.
STi Oil Pan P/N: 11109AA131 List Price: $108.50
STi Oil Pickup P/N:
STi Dip Stick P/N: 11140AA120 List Price $19.13
Oil Pickup STi on Bottom
STi on Left (Inside it has a screen but is hard to photograph)
Differences in the Baffle STi on left
Baffle (bolted to the bottom of the blcok)
Dipstick STi on Top
Dipstick End STi on Top