I have always worked on American cars so I'm not a complete idiot... Just when it comes to imports. I have a civic 4g dx hatch. It has 204k on the D15 that is in it. It is completely stock other than a cold air intake the previous owner put on it. I am figuring it's smart to replace the motor soon anyways and I thought that maybe I'd to go to a D16 instead of installing a VTEC and MPFI on my old D15. So here's my questions. Does it just bolt in other than the head and intake which I plan to modify anyways. Also I am getting so confused by these engine codes it's driving me nuts. I think I found a break out of what they where a while ago but I lost it. Help me. I am going insane reading all of these forums and just getting more confused. I don't want to change the tranny.