If your getting a 92-95 motor and your putting in a 92-95 motor then none since your car was already running vtec,so your good there,and in Germany we don't have knock sensors so you probably don't either,so your good there too.Look on the back of the block right around the oil filter your going to see a sensor with a green base and a brass nipple looking thing sticking out(i'm not sure cuz I ain't got my manual handy but this is either your engine temp or oil pressure not exactly sure),right around that is your knock sensor,if that(above sensor) is the only thing there(you'll see a plug,circulair with a square in the middle) than you don't have one.Your going to have to untape the wire loom a little to move the sensor with the white clip from the back of the intake manifold to the front of the B16's,and unless you want to cut and extend the vtec wires you need to slide the wiring harness a little closer,it will be tight but it will fit.I hope that isn't too confusing.Good luck