Yep you would more than likely get the wiring loom and ecu, but to me i would rather put a 2nd box in, sell it and buy the 03-05 STI. Seeing as it will cost you $16k for the setup + sale of your car $12k minus cost of 2nd box $1500 gives you $26500 - could get an 03 STI for that or throw in $2k extra for an MY04 STI or $4k for an MY05 STI.

Well thats how i see it!