I had to replace the stock fan due to a very stupid move I made. I couldn't believe how much better the sound got after the replacement. Since there were four in the package, I replaced the fan part and fan along with the circuit board. The big plus is that they come with connectors; However, they have a short wire length so it doesn't reach the hot end. You'll need to splice the wires, but if you have basic wiring skills and some heat shrink, it's a fairly easy task. I highly recommend these fans!
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