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I just got my racingline shifter a few days ago, I havent installed it yet but it looks good. I have no experience with the lightweight pulley.. I believe it was discontinued?
 

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you wont notice anything with pulleys. Theoretically they do the same as a lightweight flywheel
It does make a noticeable difference, lightweight flywheels makes a difference too. It gives the motor less rotating mass. Makes it rev up quicker. The pulley does remove LBS, because the pulley itself only weights 18oz's. .

but your only removing ozs instead of lbs
Wrong. Some aluminum flywheels can remove up to 15lbs from the rotating assembly. My fidanza flywheel on the se-r weights only 11lbs and my oem one was at 25 +/-lbs.

Whats interesting to me is they dont even list what pulley it is i assume its for the crank????
Yes, its the crank pulley.
 

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