Quote:
Originally Posted by 2013 ZL1 #7860
Why do the upper pulley? If you do the lower you have more pulley size options and it looks less obvious that it was changed. It is also much easier to install IMO
Jannety does the 10% OD lower pulley without a tune (use torco)
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So with the jannety lower pulley I can install without a tune? How much more will it boost?