Quote:
Originally Posted by Z OH 6
Most people recommend the lower pulley over the upper pulley even though the lower pulley parts cost more than the upper pulley. The reason why is that the upper pulley is very small to begin with so going with a smaller pulley increases the chance of belt slip and its not an easy pulley to remove so labor will likely cost you more than the labor for a lower pulley. For the lower pulley you will need an ATI damper or Innovators West. You will need a lower pulley to bolt to the new damper as well. I would talk to your tuner about which pulley they recommend because you're using an E60 mix now, depending your pulley selection, you will likely have to drop that mix down or go back to 93 octane since you'll be fuel system limited around the 680rwhp mark. At that point, you're going to have to consider a cam or meth injection.
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