All the bugeye and Blobeye WRX's have 3 cats - Uppipe, Downpipe, Cat pipe.
The Sti's from the same years have only got 2 - Downpipe and Cat pipe.
This is why the WRX's have an EGT sensor in the uppipe, to monitor egt's in case they get too high and cause the Cat to disintegrate and fly into the compressor wheel causing no end of harm to the turbo.
Russell
ps - just noticed I pushed the 4 instead of the 5 should have read VF35.