6-Speed Lower Gearbox Mounting E46 325i/330i , E85/E86 Z4 - Steel Upgrade

This lower transmission mounting bracket replaces the aluminum bracket found in non-M 6-speed E46 and E85/E86 that is prone to cracking with high power or extended race use. 

We also use it for B48 engine swaps when paired with GS6-37DZ and GS6-53DZ transmissions but can also work on an E46 330i 6 speed G36-37.

• Replaces BMW P/N: 22316760531 
• Fully welded 1/4" Steel for added durability
• Corrosion resistant yellow zinc coating 

For E46 use in combination with:

• STROM Aluminum E46 non-M 6-Speed Upper Transmission Mount
• OR STROM E46 non-M 6-Speed Steel Upper Transmission Mount 

Fitment:

E46 3 Series (all body styles: Sedan, Touring, Coupe, Convertible, Compact)

• 320d / 320Cd / 320td — M47N
• 325i / 325Ci / 325ti — M54
• 330i / 330Ci — M54
• 330d / 330Cd — M57N

Z4 E85 Roadster

• 2.5i — M54
• 3.0i — M54
• 3.0si — N52
• Z4 M 3.2 — S54

Z4 E86 Coupe

• 3.0si — N52
• Z4 M 3.2 — S54