CAC -its not a matter of upgrading the powertrain to take extra power. The airframe itself needs strengthening to take the extra power. The AH-64 is comparatively lightly built -its a fallacy to believe you can just keep increasing power without it having an effect .
As to performance -you obviously have no idea as to the effect of having ASPI on the U.S 'D' model .As it stands the U.K AH-64D will outperform a U.S
'E' model in terms of performance - the mod state and type of engine electronics doesn't come into it.
Well as someone who has flown AH Mk1, Block I, Block II and AH-64E I'm afraid you have no idea what you are talking about. I do, however, agree that the airframe needs modifying slightly, which is why it will get stripped back and re-lifed under FMS. As for not knowing what effect the ASPI has on performance.... I think you'll find I was hovering an AH-64E with ASPI fitted today and it had OGE performance at.... lets just say it was a lot heavier than a Mk1 can be hovered at in those conditions. Oh and for info a Block II AH-64D with ASPI and 701Ds will outperform an AH Mk1 in most conditions too. 5 years ago you would have been correct but not anymore. Maybe stick to your book reading and leave procurement to those that know?