The Race Series Engine Mount Bushing Kit is designed specifically for IAG Subaru EJ engine mounts. IAG’s engine mounts feature the ability to swap bushings for street or track use. The Race Series kit includes (x4 2 piece) solid steel bushings that are gold zinc plated for oxidation resistance. The solid metal bushings attempt to completely reduce the forward and backward movement of the transmission and engine under hard acceleration. Due to the bushings design and material additional NVH (Noise Vibration Harshness) is perceivable through the interior.