No, didn't change cat. Duncan at RaceDynamix said I'd make 290 removing that cat. Duncan said he typically gets more from a 2004/2005 blob as opposed to an earlier one.
I don't do my own work on my cars any more so it didn't really work out cost effective for me to do the cat (2/3'hrs of labour?) for an extra 18bhp.
My Subaru specialist mechanic recommend doing the pump, for an extra £80 not worth taking the risk.
Where are you based? I traded in my wrx into a dealer so I removed a few bits that I need to sell cheap