I wouldn't bother going with the swap methods anymore, too much of a pain in the ass and it is always the last method to get patches, fixes, ect. (ie to my knowledge you can't get a working backup of GT4 with it as of yet). Paying a trusted installer to solder the chip is the best option, if that is out of the question then go with the HDLoader/HDAdvance Harddrive upgrade mod. It won't cost you that much more and it is SOOO much less hassle than the swap discs. It is also one of the first methods to get patches/fixes for it which is critical on the latest and greatest games.