Beware on the after market Torqflo fan clutch...When the comment was made, "it sounds like a semi" he means it,IT REALLY DOES SOUND LIKE A SEMI! I mean this thing is round tight...When i had mine put on about 3 years ago, i thought, well... after a while it will get loose and quieting down...NOT!!..Im not sure but i think i lost some horse power as well due to the thing pulling all the time..but to be sure,it does cool well.