<< 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. >>
Cheers for that Russell! The exhaust guys thought there were only two - downpipe and the stand alone cat. Looks like I'll need to remoce the up-pipe cat too. Still don't want the headers. I note Andy F has ported the standard ones so maybe get that done. What is actually done when the headers are ported - is that literally polishing out any imperfections inside???
Brian