The good news is the transmission being a fairly straightforward and simply unit is easily upgradeable. Eurocharged released their upgraded parts which they have tested with the W211 E55 AMG and they guarantee capability to 1000 horsepower:
Eurocharged is pleased to offer our 1000HP 722.6 Transmission Upgrade!! This upgrade is a MUST for any high performance 55 AMG or 65 AMG. We guarantee the transmission to hold 1000HP.
Our kit Includes:
- Alto Red Eagle clutches K1, K2, K3, B2
- Kolene Steels K1, K2, K3, B2
- Alto Clutches B1, B3
- Alto Steels B1, B3
- Seal Kit
- F1 & F2 Freewheel Clutches
- Machined Pistons K1, K3
- Output Flange Nut
- Blue Top Solenoids
- Tech support!!!
The price? $3800.00. This is a must for high torque 55/65 AMGs.
Here is a breakdown diagram of the transmission so you can understand the pricing and what is internally upgraded: