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The internal engine components of a Legacy B4 twin turbo are this the same spec as an STI 6 and if not will a Legacy b4 benefit from a rebuild whit Sti components.
Do you mend also the turbo's are just the block from a STI 6 because at this moment is a twin turbo setup much more torque and the same power than a STI 6 206kw
Yes you need to use all of the STi-6 engine... the B4 may have slightly more torque.... but try to modify it ! the STi will easily beat the B4 once you spend a little on it.
not sure about later models, but V3s are pretty muc a slot in and go job - the heads are different of course, but much else is dropped straight in...
One of the guys on the legacyb4 group at yahoo had to do an involuntary upgrade to his car after a problem, and he found the V3 bits to be a fairly easy job (naturally the money bit hurt ).