i have a b16a1 block and was planning on getting a gsr head and put it in my 1990 crx si. what wiring harness and what ecu do i get. i also need this car to pass smog? to i get a wiring harness for a gsr, one for a b16, or one for a crx?

 

you need to use the Si harness and just add the wires for the VTEC - everything else should plug right in - PR3 or PW0 ECU