I had struggled to find fans thin enough to fit my setup that also flowed good air. I bit the bullet last year and bought a Delta Pag 18" brushless 4000CFM fan and controller. I ran a dodge intrepid dual fan setup before but it was starting to give me trouble and the aftermarket changed the design and I had to update. The brushless fan is soft start and variable speed and it works really well. I never have had any runaway cooling problems but I have seen over 200* on drag week especially on long highway runs. The delta pag fan did get over 200 last year but it was with 2 hours of 5-6 lane crawling traffic.

I just changed to a dual pass radiator and I was able to tuck it closer to the core support so I think I will be able to have my friend fabricate a shroud for the fan this time.