Yea that happens alot, if the bolts that hold on the turbo dont have the factory lock retainers for the nuts. The nuts will loosening due to vibration, Like he said ^^^Any easy fix is to use lock washers and sealeant. :bigthumbu
You can heat up the spindle area with a blow torch and after a good amount of heating use a ball jointer seperator or beat it out with a hammer.( make sure not to burn the ball joint boot ). :bigthumbu
No mods, just take out your ka injectors and put in your sr20det injectors, but i suggest changing the fuel pump and fuel pressure regulator if your gonna run bigger injectors on your ka.
I can do the swap, done plenty of them. I do it in my garage and it will take me about 1-2 days as long as you have all the parts.Heres a pick of one I just finshed. If you have any questions call me 561 6851963,will work something out.