The results of this thread will most likely determine whether or not I buy a civic at all. I'm trying to carefully plan how I'm going to go about doing what I'm about to ask. What I want is a Civic, either a 4 door or possibly a coupe with a '96-'00 body style and a D15Z1 engine with 3 Stage VTEC. This to me would yield the most ideal circumstances I could ask for in a honda civic and most likely any vehicle. I could get the fuel economy I want, I'll get the power I want, I'll get the safety I need and I don't have to get a hatchback. I do not own a honda yet, I am looking for a car with good mileage but isn't slow on the road which is why I'm asking for help with the above idea. I've had prior experience with honda civics (specifically 90s) and they've been mostly positive, in fact I can't remember anything I didn't like about them so that is a good start. I live in the USA, because americans are stereotyped as liking to waste gas, I can only assume that is the reason why they didn't bring a 3 Stage VTEC with a D15Z1 engine over here. I realize the D15Z1 engine in the USA comes with the '93-'95 Civic hatchback and that in its default state only makes 92HP. However, if I'm able to take that engine, update/upgrade the necessary parts to have 3 stage VTEC, and then install that engine into the body of a '96-'00 civic, I'd be good to go. I do not know where to begin in searching for "3 Stage VTEC" in the sense of a part. I'm sure I could find an engine with 3 stage VTEC but that isn't quite what I want to do for numerous reasons I don't care to cover. I want to know how and where I can get the parts specific to 3 Stage VTEC as everything else is the same. Here are the following things I already know: The D15Z1 engine is ODB-I in the USA, in europe/japan the D15Z1 with 3 Stage VTEC is ODB-II. ('96-'99 over there) The '96-'00 Civics use ODB-II From what I know, I think you can put VTEC from a D15 series engine into a D15 series engine w/o VTEC. From what I know, I think you can put VTEC from a D16 series engine into a D16series engine w/o VTEC. I do not know if you can put VTEC from a D16 onto a D15 series engine that didn't originally have VTEC. I want to know what I'll need in order to upgrade an american D15Z1 engine to have VTEC Stage 3 and I wanted to know if since this will now be ODB-II, will the installation of this into a '96-'00 civic body be anymore or any less difficult than this installation into a '93-'95 Civic VX hatchback. And finally, will this be smoggable? I mean I wouldn't be using a JDM engine, just a JDM tweak, much like putting an ECU from a different car or a JDM ECU. Right? Not to mention that it isn't easy to spot 3 stage VTEC unless you know what to look for. I'm outta breath, hope you guys can help!