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57mm is about 2.25 inches..
thought the optimum was about 67mm..
i ran about with my custom exhaust (64mm bore) for months, noticing only a small gain, then had it remapped and there was a massive difference in torque.
Looks like a sports cat to me too... plug both sensors in..
If you can shine a torch into it, cat's usually have a few layers of gauze/mesh in them (something about trapping hydro-carbons n' that)
there's a few places the cold air feed can go, but most of them involve scaping knuckles and a bit of swearing!
Tiny bit more room for Cup's without the air con...