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lightning upper pulley = 2.93 stock size
Harley Upper pulley = 3.25 stock size
both stock lowers are the same size.
The lightnings smaller upper pulley increases the RPMs of the blower which in turn provides 2 more pounds of boost (8lbs) over the Harleys (6lbs).
The lightning also has a more agressive stock tune. Couple this tune with the smaller upper pulley and that is why the Ligtning puts down Higher HP/Tq numbers than the Harley.
How is that?
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