Originally Posted by 4S-TURBO
which leads me to my next question: is the n/a oil pan sufficient to run, say, a bolt-on turbo kit that's designed for n/a x-member/headers, pushing a bar of boost with the sti s/b and n/a sohc everything else?
It's fine. Depending on what year your model is you may already have a regular wrx (5qt) oil pan, the older RS's came with 4.5 qt pans. The STis pans are different for twin scroll manifold piping (which... they don't even come with...)