I haven't tried the dual fans, only the single 16-inch puller fan for our AMG M104 wagon (2300 CFM).
She works beautiful, and keeps the temps very cool.
Satish of www.mbcoupes.com
installed dual 12-inch fans (can't tell if their DUALS or two independent 12-inch fans) in his 560SEC with a M119 V8.
1988 360TE AMG