Mechanical clutch fan is a parasitic drag on your crank (HP loss)
just how much is still up for debate, but it is less drag on your engine with one less accessory to turn.
I like how replacing two stock fans with one large one frees up engine bay space.
$100 mod is worth the extra room and clean look alone IMHO.
..also makes more room for my RIPP supercharger ...coming soon.