The 034Motorsport Street Density Transmission Mount is a performance upgrade for the factory transmission mount assembly. It replaces the factory mount's soft rubber damping medium with a high durometer rubber, which provides better support at higher power levels. This mount is a direct, drop-in replacement that limits unwanted transmission movement and improves performance. 034 also offers a billet aluminum Transmission Mount Insert that can be used with the upgraded mount to further improve performance. This insert fits into the large void in the factory transmission mount, limiting transmission movement without sacrificing ride quality or increasing NVH.