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for money wise the 2.3 pulley is cheaper. but far as vibration, there are several people using the UR pulley with no probs. The chances of the A/C and alternator causing enough vibration to cause a bearing to go is very slim chance.
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72 442 "THE BEAST", 99 Alero - OSV Replica w/ original OSV parts, HURST Dual/Gate Shifter
Beware of the BackStabber
 
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