These are all good points, but I wanted to visually see the difference between the newer kits and the tc4, and that was the first visibly noticeable difference. My tc4 refused to compress the springs when making a turn, and would rather traction roll instead. Lowering the roll center that way, and by that much, should make the springs compress, and absorb the lateral energy better. Hopefully it will work because I have tried pretty much everything else....I dont know if anybody else has already tried it since I had to trim the rear shock tower a bit to fit the ballcup...That's with 5mm ride height, by the way.....