Those Nikko coolers and all type's of 'intercooler' are generally not a good addition to 360's, from what I've seen, they cause more trouble than what they're worth. You can add more fans internally to the 360, xbox-scene and llamma have plently of tutorials on the cooling subject ;)
Nikko makes the intercooler, a cooler for the xbox. but i have heard stories about them overheating themselves, another company called titan makes the so-called xfan, a silent cooler for the xbox, however, i don't know where to get it,
our xbox 360 just started playing games to a certain point then quiting some games it won't load it...
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our xbox 360 just started playing games to a certain point then quiting some games it won't load it is only 6 months old