Let the pictures speak for themselves. I was going to bed, but I couldn't resist
sign12
Scythe Mugen2 stock fan vs TRUE 1366 stock fan
Intel Core I7 @ 3700MHz (1.336v)
Room temp 25c
Scythe Mugen2 120x120x38 @ 102CFM vs TRUE 1366 120x120x38 @ 102CFM
Intel Core I7 @ 3700MHz (1.336v)
Room temp 25c
Scythe Mugen2 120x120x38 @ 102CFM vs TRUE 1366 120x120x38 @ 102CFM
Intel Core I7 @ 3700MHz (1.272v)
Room temp 25c
Keep in mind TRUE=Megahalem; Megahalem=TRUE
Source