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And have taken many physics courses.. Theorey and conjecture is relative, proof and evidence is emperical. Whats your next arguement going to be that we should go back to a stock flywheel because it can better dampen viberation? I think you guys need to keep chill on your opinions people aren't as stupid as you guys are assuming, everyone knows the risk of a modified car. And until you got proof some real proof don't just jump all over people's case.. Currently the proof shows that people with 30K+ have had very few problems with the UD pulley. And while someone may have had a rod bearing failure to simply point to UD is not good enough. Take a lighten Pulley spin test it to 7200RPMS and record the stress on the axle and then repeat with a stock UD pulley. Then you will have some real data :-) My money is that the UD pulley is already well balanced since it is such a light weight item to begin with and it shaped while being spun.

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