034Motorsport Street Density Transmission Mount Insert for Audi A4, A4 Quattro, S4, S5, RS5, Q5, and SQ5 (2008–2017)

Audi's factory transmission mount on these cars uses a soft rubber damping medium, and the 034Motorsport Street Density Transmission Mount Insert replaces it with 65 durometer rubber in the A4, A4 Quattro, S4, S5, RS5, Q5, and SQ5. The soft stock medium lets the transmission move too much at higher power levels and can break down over time. You feel that movement as hesitation or lurching when accelerating, decelerating, and shifting. The stiffer insert limits that movement for crisper shifts and sharper throttle response. It fits cars with either the manual or automatic transmission. It is made in the United States.

034Motorsport covers this insert with a 24-month warranty.

The insert is the economical way to service a worn mount. Audi does not sell the factory mount assembly components separately at dealerships, so a failed damping medium normally means buying the complete assembly. This insert lets you keep the factory cast portion and replace only the rubber. It upgrades factory assemblies Audi numbers as 8K0399151DB, 8K0399151CD, 8K0399151BF, 8W0399156AR, and 8W0399156AQ. 034Motorsport and independent Audi enthusiasts tested it before release. It does send more noise and vibration into the cabin, and 034Motorsport notes this is most noticeable on Tiptronic cars.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-509-4025
• Product line: Street Density
• Material: 65 durometer rubber
• Transmissions: manual and automatic
• Replaces the factory damping medium and reuses the factory cast portion
• Made in the United States
• Warranty: 24 months

Installation & Tuning Notes

The insert drops straight into the factory mount assembly in place of the stock damping medium. 034Motorsport describes installation as straightforward and fully reversible, so the stock medium can go back in if you choose.

Common Questions

Will I notice more vibration?
Yes, some. Expect more noise and vibration in the cabin, especially with the Tiptronic transmission.

Do I need a whole new mount assembly?
No. The insert reuses the factory cast portion of your existing mount.

034Motorsport, founded by Javad Shadzi in 2005, develops and tests its Audi parts in Fremont, California.

Fitment & Compatibility

Check the fitment table below for your model and year. PMB can confirm fit by VIN before you order.