Why are you getting so hung up for 20bhp?? I doubt whether anyone could really tell that there is any difference in claimed horsepower from one year Zed to another.. the only comment I have heard is the newer model lacks a bit of the midrange over the older car..only a real aficionado could tell by looking at one car to another what model year it is, slight cutout in lip of front spoiler and slightly different bulb configurations in the lights, hardly a reason to dismiss a bargain if it arises in a pre 2006 car