imho, a cooler is a cooler as long as it cools the air going into the turbo therefore i cant justify spending x amount on a jap brand kit which is why i opted not only for a generic but also piping. If it was a performance mod in terms turbo, piston etc then maybe i'll consider jap brands.
On a side note, my piping blew off this afternoon and was destroyed in the process. Not happy, i need to clamp it tighter after getting new piping for the return route. Even worst was that i wasnt even on boost, revs was only at 3 grand. So a note for those doing this mod, make sure that your piping is definately tight ass before boosting it or attempting to boost it especially the 180 degree's return piping.