After developing the wildly popular rear differential mount for the B4/B5 Audi chassis, Apikol has developed a high performance rear differential mount for B6/B7/RS4 enthusiasts to enjoy! This mount provides a more precise feel by eliminating drivetrain movement and clunks when getting on and off throttle. By replacing the soft factory rubber mounts, which deteriorate over time, you gain a crisp, tight feel that enhances your overall driving experience. The mount is constructed of high strength billet aluminum alloy with a high quality polyurethane bushing insert. Select your desired bushing firmness above. Street(blue) or track(red).