Thats not how this turbo system works. Its not a sequential set up. Equal sized turbos are attached to 3 cylinders each and provide their own boost to each side. BMW preferred to use smaller turbos with quicker spool on each "bank" to ensure low end torque. Regardless of how the turbos are set up final drive still means nothing in the power category.
"Every man gotta right to decide his own destiny." - Bob Marley
'93 Toyota LandCruiser