Its because the GTiR trans is huge, It also has an output shaft for the rear drive axle that interferes with your power steering rack and your rear cross member. Its also a Hydraulic clutch.
There is a guy that put a BB DET in his USDM Pulsar and then used the GTi-R tranny. He used some B12 Sentra AWD wagon suspension parts and then fabricated some parts also. He made it work though, so anything is possible. Here is his link: http://ffdet.com/members/rich/
GTI-R Trannys cant hold much power either....from what I have heard talking to GTI-R owners. The only reason I would see for putting that tranny in would be to convert to awd....which wouldnt be fun, but would be quite an acomplishment!
I think that if you got a Whole front clip firewall forward it would be possible if your experienced and know what you are doing. Its something that I want to try at some point. Could be fun even if it can't be done....
Even if the tranny is weaker than the BB, you can always upgrade the internals of it Pfitzner Performance dog gears in it. Also there are other things you can do to a tranny to make it stronger: Cryo treat, weld the case, etc.....
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