No need to change your manifold, waste of time and money, being in japan, the wrecking yards would be full of remapped stock ecu's, which i would imagine would be worthless over there, if you can see the mods to a car before you pull the computer out, then you can get one that siuts your mods. I would get an rb25 turbo if you need to replace yours. I wouldn't bother with an emanage, as you really arent going to make a lot of power with your list of mods, and the mapping in the r32 gts-t ecu isnt that bad.