The Anderson Design & Fabrication Anti-Wobble Insert is a direct upgrade over the soft factory transmission mount insert in your Subaru Crosstrek, eliminating the clunk and shunting sensation that builds over time as the OEM rubber wears. The ADF insert tightens up drivetrain movement without the harshness of a solid mount, giving you more responsive throttle and a more connected feel, especially noticeable if your Crosstrek is lifted or running larger tires.