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There are about 100 threads discussing this. I’ll give you the basic run down.
Ppl say it’s pointless.
Ppl say they can feel a big difference on butt dyno.
Ppl say subaru/Toyota say stock pulley has a balancer/dampener.
Ppl say stock doesn’t have a balancer/dampener.
Then the people with half a brain have researched and done the math/physics calculations to essentially prove its pointless, as well as stock does have a dampener ring on it.
Fluidampr Pulley can potentially reduce high rpm vibration/frequency especially the more none stock you are the more beneficial it potentially can be.
And oversized/underdriven accessory pulleys can free up close to 2hp.
Now you have at least 90% of all the information from 1000s of posts about this subject.
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