I own a Mazda RX8, and I wanted to know about upgrading my pulleys. Is it worth

  • Thread starter Thread starter So Smooth
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So Smooth

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the effort.? I just want to know the pro's and cons, I have heard somee good things and some bad, I have have heard go for the underdrive, some say go with the crank pulley, just wondered if anyone knew about this stuff?
 
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