034Motorsport Billet Aluminum Rear Differential Mount Insert Kit, B9 Audi A4/S4/S5/RS5 & Allroad

The B9 Audi A4, S4, and Allroad are equipped with rubber rear differential mounts that can deflect under load, leading to a vague rear-end feel and suboptimal handling during both on-throttle and off-throttle transitions. 034Motorsport’s precision-machined billet aluminum inserts are designed to fill the voids in the factory mounts, limiting differential movement under load while maintaining ride quality and without introducing noticeable noise, vibration, or harshness. The result is a more connected and refined driving experience.

These inserts are engineered to work alongside the factory rubber mounts and were developed using CAD software, thoroughly tested and refined to deliver a significant improvement in handling performance and shift feel. Tested extensively on 034Motorsport’s in-house B9 Audi A4 development vehicle, the inserts provide a straightforward, completely reversible installation.

Constructed from T6-6061 billet aluminum, CNC-machined in-house, and finished with clear anodizing for durability, these inserts reduce rear differential movement during launches and acceleration, resulting in crisper shifts and improved handling without adding any unwanted NVH to the cabin.

Included in the kit are two rear inserts and one front insert, providing a complete solution for enhancing the rear differential performance of your B9 Audi.