go to www.wkdtrbo57.bigstep.com (http://www.wkdtrbo57.bigstep.com) . i just updated it. all u have to do is type in your car's weight and off u go. i am trying to promote my site. for you NX guys there are 30 or so links for nissan only stuff-from turbos to body kits to nos to carbon fiber hoods. check it out... thanks