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I had the MY93-96 ARC one (is thsi what you're on abou?) but didn't get round to fitting/mapping it. I sold it to member Scoobjam74. PM him to see what he thinks, etc...
TBH beeny, the small slanty ARC ain't gonna flow a great deal more than the OEM one. So you shouldn't get much more than 290-300 I would have thought (OEM one good for c.280).
Even then, your 380cc injectors will be right maxed out, regardless!
Personally, if you still want to retain a TMIC look, then I'd fit one of the best OEM ones available - which will be the Bugeye or Blobeye STi one. These are good for 400+ bhp, so future proofed, somewhat.