Engine Mount Inserts, Powerflex Track - G20 M340i, G22 M440i, G29 Z4 (B58TU)

These clever polyurethane inserts install around the factory rubber B58TU engine mount on G20 M340i, G22 M440i, and G29 Z4 M40i. These are a 2-stage design, allowing you to fine-tune how much deflection is reduced. By reducing bushing deflection, you will increase bushing rigidity and longevity. These are the Black Series bushings, which are approximately 80% stiffer than the red Street inserts.

This kit includes 2 urethane reinforcements per mount. Use the "A" mount around the middle of the mount. Then add the "B" mount on the top for extra strength.

These inserts are specifically designed to work with BMW or OEM engine mounts - part numbers 22116860465 and 22116860466. Sold for a pair of mounts.

If your stock B58 motor mounts are still in good (or new) shape, these Powerflex Bushing Inserts are an ingenious way to protect and improve them!

Powerflex has extensive experience in automotive suspension and chassis systems and has combined these skills with advanced polyurethane manufacturing techniques. Durometer is standardized per fitment and location, so you can rest assured knowing the design engineers have selected the optimal urethane hardness for this specific part.