they are quite easy to put in with a bit of grinding away, the wiring needs to be changed though, i am about to do my second one of these, an auto-elec did the wiring on the first though, im going to copy it then post a wiring diagram for it for you guys to copy

basically it puts out max of 70-85amps (depends which u get), instead of 25amps, good for BIG stereo, BIG driving lights or injection setups

i already have a computer diagram of how to mount one on a passenger side alternator car (in my photo gallery)
ill get a pic of how i modified the mount for a driers side alternator car aswell when i do the wiring

But the a-seriers will loose 30hp spinning it
But hey I have a camry hitachi one with inbuilt everything sealed fan and much like all the new alts and its smaller and puts out the same 80 amps.
Ill get picks up next monday along with the early bluebird diff with the h165 alloy hat from factory thats the same length as the D1k one.