A 12inch perma-cool pusher is flow tested at 3300cfm where most slim line puller fans only claim 1200cfm with no flow testing data. I actually use one on my LS swap and the improvement was noticable over slim fans. More noticable was the electric water-pump and oil-cooler used as a second heater core with it's own fan.

In s-chassis where clutch fans are too close to the engine (JZ, LS, RB) this or the taurus sho fans seem to work best. The SR isn't as air trapping as the KA, but if your overheating always pressure test, test cap followed by a proper bleeding.