o6 legacty gt spec b jdm, catless or catted factory uppipe and aftermarket ecus

[shadyslim]

hi guys im a noob when it comes to subarus,

i was wondering if a 06 legacy gt spec b jdm version has a catless uppipe and what other generation of parts would work on it and if it has a aftermarket ecu or just the stock ecu?

pics below (excuse the terrible English and whats the white cord for too?