While under the car I looked over a few other things. Car definitely has rust, but it does seem to be all surface rust, will have to treat it later on.
Found a smiley face on the rear subframe
Stock Exhaust Size
Measured the stock exhaust, 2.37" OD for midpipe, same as STI.
Then the exhaust splits into two 1.7" mufflers
I got to admire the aerodynamic steps that Subaru designed. It is very impressive that they could get such a big car into 0.29 CD range and here is why.
Belly Pan "Diaper"
Smooth plastic to reduce roughness
Rear tire air deflectors
Rear bumper is almost flush with the bottom of the trunk, this is a big one that Nissan failed to do on the G20. Even then the G20 sports a fairly low 0.30 CD still!