Have you ever driven a car will a full set of poly busings? As long as the rest of the suspension is in good shape (shocks, springs, ball joints, etc) these just make everything work better, or at least the way it should. I got these for a 2000 AP1 S2000, front, rear, and differential, now I need better tires. Just because they are now the weak link in an amazing machine. Installation is not easy, and takes some time, but bang for buck, there is nothing better. Thank you Energy!