The Whiteline Plus rear differential mount inserts or "traction control" kits for the 03-06 Mitsubishi Evolution 8 & 9 are an easy to install solution to get rid of the "clunk". Have you ever experienced that terrible clunking sound during shifts? That is your differentials moving around! The Whiteline differential mount inserts will get ride of that annoying sound and get more power to the ground. The diff mounts in factory form allow the diffs to move around a lot. The clunk is most noticeable during acceleration from a stand still and shifting gears quickly. The Whiteline kits will provide the driver with a precise gear shift and predictable clutch engagement as well as a more solid feel during drifting.