That rad needs high CFM/Pressure to work properly. May I suggest the following brands of rads.
By the way, the BI Stealth series is very old and a poor performer by todays standards. Do not buy it.
Here are the 5 rad brands/makes worth the trouble to look at.
Thermochill
XSPC
Feser
Great for low to med speed fans. Rads cost more but I like low noise.
Swiftech MCR series, very good with medium fans, and a good performer. Best cost vs performance out there.
Black Ice GTX (BIX) The newer BI rad on the market. It needs loud HS high pressure fans. Thats why they said 6 fans. Or you could buy 3 fans at $25 each and only have three fans. Ohh buy some earplugs too.