finishing up some pending projects i had on the car, i installed my headers and it put my o2 Sensor directly sitting inside my AC fan, my primary fan functions properly and the car doesnt overheat, but i wanna replace the AC fan with a slim line fan....what do you guys recommend to be the CFM for this fan? I saw some fans on ebay, ranging from 1500 CFM and up...not sure if 1500 would be adequate to run with my stock cooling fan for the ac....any ideas?