i've installed theMarch pulley kit, quite easy, you can feel a small difference in power
but i dont know if all crank pulley is like the march (you need to screw the OEM crank pulley on the march for the damper)
If you search this forum you will find Steeda pullies are the way to go. I like mine. Do not get piggyback style. The steeda's replace the whole crank pulley for proper balancing.