My friend has a 90 DX and has a 90 Si motor sitting at home. The Si motor is still in the original car, (car was in a rear end wreck), and hes just waiting to put the Si motor in his DX.

-Is this a basic bolt up swap or is there modifications needed?
-What will we need to swap it and what kind of wiring?

Sorry if this has already been covered, never come in the 92-down forum, just need a little help. Thanks in advance.