It will ruin its stealth abilities, but then again a Kraken doesn't worry about such things.  [H]ard|OCP had a chance to test the new Kraken X42 from NZXT, with a pump they advertise as more efficient and with quieter operation than the previous model, along with a new 140mm fan.  The performance of the X42 on high speed offers almost exactly the same performance as the X60 on low, which is a shame considering the ~$130 price tag.  It seems that NZXT put a lot more effort into the RGB effects than the performance of the cooler.  If that does happen to be your thing, you should check out the review here.

"The new NZXT Kraken X42 is its new "entry level" All-In-One CPU liquid cooler. The Kraken series is not new to us, but NZXT makes a lot of claims about this cooler being better in many ways, and of course has all kinds of cool RGB LED lights built into it. But all of this comes a price. Does it keep your CPU cooler while overclocking?"

Here are some more Cases & Cooling reviews from around the web:

CASES & COOLING