Well, honestly I'm not positive about compressing the springs to get em to fit, but I seriously don't think that is the case though. I believe the most you need to do is grind a little metal out of the mounts to make the mounting bracket slightly wider to accomodate for the yfz450 shock (I think the 450 shock is almost the exact same length as the banshee shock give or take an inch or less). I know they WILL work, and have heard great reviews about them, and they are a cheap alternative to buying a set of works or better shocks...I can tell you that I plan on getting them, simply because I don't do a lot of jumping or riding that would require a superb suspension, so in turn I wouldn't wanna spend a butt load of money on a hardcore setup...something a little smoother would be perfect, especially for a smaller price; and I believe that's what you gain from going with the YFZ450 shocks. If you look hard enough, you can find the shocks going from $150-200...