I belive that the rear arms are the same lenght as the old ones (exact the same lenght as Tc3 arms). The front arms are longer than before (Tc3 again) and new front hubs make it possible to mount the shock farther out on the arm just like the "reartower up front" on the Tc3. The Evo 4 looks almost identical to the prototypes Hpi used at the worlds two years ago and that car was really good.