Doesn't increase power. Instead, it prevents a potential problem.
Thai said it best in his earlier post:
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The rear axle, instead, has a little breather cap (withOUT the hose) on top of the axle. The silver cap acts as a one-way valve. When the axle housing gets hot and pressure builds up, the cap pops open, releasing the gas and then closes down to prevent water from getting in. HOWEVER, in theory, this cap can malfunction, especially when you have mud/dirt sticking to it. This can happen if you off-road often or cross streams often. And if it malfunctions, then water/mud can get into the differential housing. That would be bad.
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So look at this as preventative, and worth the $15 and 30 minutes to be on the safe side.
