In the neverending search for more HP, this is a way to get some. I wonder if you could swap the 4.2 stock system with the twin electric fans system in the RS6? Anyone looked at this?

Remove the mechanical thermostat and belt-driven water pump. Replace with variable speed electric water pump that circulates only the minimum water flow necessary.<ul><li><a href="http://www.daviescraig.com.au/main/display.asp?pid=8">Davies Craig</a></li></ul>