The dual Lexus fans. They fit perfectly in the space the condenser used to sit, although there is still room to put one back in and re-mount them if I decide to reinstall A/C. They cover nearly the entire radiator surface, and with the 305 TBI electric fan on the backside a huge amount of airflow moves through the radiator. The car barely reaches operating temp, even in stop n go traffic on hot, humid days.