400ex Rev Box

Is it worth getting an aftermarket CDI Box. Ive heard that they are bad for you bike and pointless to put on. I just want to get a little more power out of my bike before I decided to finally bore it out.


I have the same quad and my boss said with a 440 big bore, cam, knn and full exhaust it would be smart to get the rev box to help unleash the power. I would recommend getting a bigger oil cooler like from a 2005 Yamaha 4x4 with a cooling fan.

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