Empire Performance Engineering mechanical fan clutch conversion kit for the 6.4L Powerstroke. Convert your 6.4L Powerstroke to a mechanical clutch setup and see increased air flow at lower engine RPM for increased cooling of not only the engine but also the interior cab space. Made for service & other off-road trucks that sit at idle or elevated idle (PTO needs) for a majority of the day. Due to the increased engagement of the fan it is not meant to be used with daily driver trucks as the roar from the fan is quite loud. Tuning may be required to eliminate stock fan clutch codes.