I'm looking into buying an OBD 0 B16 swap for my OBD 0 CRX, engine come with the harness, ECU, etc. My CRX currently has the stock D15 dual point injection engine. Should this be a plug and play swap or do I need to do any additional wiring?

 

You need Wiring Done. since your dual point you got to go mpfi and since you have an Dx model you also need to replace your front hubs/disks to Si crx ones or Intregra ones.

 

you need a lot of work and to do this you need to do a lot of searching. At the upper right hand corner there is a red SEARCH. Click that and search for something along the lines of b16a swap or anything like that.