the original stock crank pully is heavy :
i) due to it's weight, it's kinda slow to start a rotation in other words acceleration on low-end torque is mild
ii) also due to it's weight, it tends to create faster rotation and greater rotation input - actually good for alternator
iii) due to it's weight the rotation input is kept longer or spinning longer - which reflect to decreasing of RPM slower (while in gears)
LCP is well-known as light :
i) lightness of it gave on easier of starting the rotation and faster achieving high rotation input - acceleration lightness and better low-end torque
ii) even on easier to gain faster rotation it lack the capability of maintaining the great rotation
iii) coz of it's lightness the high rotation input decreases greater allowing the crank shaft to stop faster - yup good for brakings
actually same effect as using light and heavy sport rims, heavy rims poor pick-up but good top-speed. light rims good pick-up but top-speed limited..

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So is it recommended and worth to use LCP?hehe besides,any recommended seller to buy osram nightbreaker?i saw many good comment about the stuff..might want to try it..hehe