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Did you guy catch a copy of the latest Hotstuffs Mag, there was a mention on the Harmonic Damper by Alutec exclusive agent: "There has been much internet hearsay and rumors on this common myth - that harmonic dampers are needed on aftermarket crank pulleys. people are getting their crank pulleys confused with the harmonic dampers found on some American domestic V6 / V8 engines, found commonly on their "muscle cars". These older American engines need an external balancer, AKA torsional damper / balancer to balance the crankshaft rotating assembly. However, this is non-existent in moden engines today as our engines are internally balanced. Technically, the harmonic damper does not exist in modern engines especiially so in Japanese and Korean makes. What you may see on O.E pulleys found on some cars is a rubber ring called an elastomer. This elastomer is NOT a harmonic damper and DOES NOT aid in the balancing of the crank pulley in any way. The elastomer in the O.E pulley serves as an isolator, which is there to supress natural vibration and noise from the engine itself. The elastomer is only found on selective car makes and not every car has one. Adding an elastomer, including the sealing agent to glue it to the pulley, adds weight to the pulley and defeats the sole purpose of installing a lightweight crank pulley - which is to reduce weight to gain lost horsepower and torque." True? Regards,