will swapping the head on my d15 to a d16/17 head do anything?

 

depends, you could swap a vtec head and then you would have vtec. Also you cant swap a d17 head onto a d15. D16y8's have vtec, so you could swap that and then you would have to get an ecu that also had vtec and hook up the correct wiring...There are tons of stickies threads about this just use the search funtion.