On MT, oil leaks from the rear cam plate (passenger side) and drips directly on top of the header cover. You can easily check for a leak there by swiping a paper towel underneath it.
This aftermarket part is the shape of the cam plate:
http://www.raceseng.com/cam-plate-20...r-s-subaru-brz
I figure enough oil will cake on there at the seal to not be any trouble. After awhile the burning odors went away, I haven't noticed anything burning off the headers in awhile.