Have you tried it yet? I built a second buggy up with the T4 chassis. To me it mellowed out the buggy. I felt like it jumped better and you could push it harder but in the end I liked the on edge feeling of the buggy chassis better. I abandoned it when we went inside last winter. One note it was not the t4.1 chassis so it may be worth another look. You going to Loganville next weekend? Gonna be fun! Triple A-mains!