Is it advisable to "upgrade" to a lightened crank pulley?

[projectRDM]

I don't know about the SR pulley, but the whole 'harmonics' deal for KAs is complete bullshit that's been passed on for years. The rubber damper in the KA crank pulley separates the A/C portion, it's designed to reduce shock when the compressor is engaged, that's it. People for years removed that front portion and the damper and ran it in SCCA and road events before Unorthodox came out with a lightened version. I ran the UR pulley on my old car for nearly nine years, never had a seal leak, spun bearing, anything. That block is now in my new car, still fine with nearly 190k on it. UR did do a redesign because the early versions wore on the crank seal, they added a steel sleeve right after the first production run to fix it.