I have the fan mounted in the hole of the shroud, not very close to the radiator(about the same depth as the stock fan). I have no issues running hot. I know that I have read where installing the fan as close to the radiator as possible is optimal. The reason I chose to mount mine in the shroud, was that then air would be pulled through the entire radiator, not just the center. I never experimented with anything.
With mounting another 16" "pusher" to replace the AC condenser fan, it should work really good, and using a SPAL fan-pwm when it gets hot enough they both will be running full on and pumping more air than just one.
Let us know what you find out in your research.
Everet <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />