I was wondering if anyone had a diagram of the full exhaust system for a WRX and if it labeled the downpipe and uppipe and where all the cats were etc. Thanks in advance.

 

try subaruparts.com
not only do they have diagrams, they have the part numbers!

 

In the way people talk around here, in order from block to atmosphere:

drivers side exhaust manifold (driver's side only), crossover pipe (driver's side only), Passenger side manifold (has O2 sensor), Uppipe (cat and EGT sensor), turbo, downpipe (cat), midpipe (cat and O2 sensor), catback section (resonator and muffler), muffler tip

 

Thanks a lot! It really helped!