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Look down into the box. If its honeycombed then its a cat and likely to be UK, if it has a perforated tube going all the way through then its JDM (and not just STi).
I guess that the STI one, as the uk ones have that exact same box, albeit with a cat in it, and then another little silencer behind it, so therefore the uk one is different to that one, ie, yours is jap one!
