I had the exact same thing when I bought my Hawkeye. The Prodrive box completely stopped any of the sound a Subaru is meant to make.
I ended up getting a Milltek system through Alyn at ASPerformance. It's by no means the loudest system (good for trackdays etc.) but sounds just perfect IMHO. It is quiet enough not to be annoying on long motorway hauls, but sounds great when you give it a boot full.
I doubt there was any real change in performance as I decided to leave the cats in place for ease at MoT time. After fitting and a change of air filter, it made 316 bhp and then after a conservative remap made 338 bhp. Can't remember torque figures off the top of my head, sorry.
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