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Thanks Stugray.
I agree that the motors aren't necessarily 100% balanced from the factory (as 4 cylinders are inherently imbalanced), but I doubt the pulley contributes much to that but I can't say for sure (safe bet would be not to touch it). The two piece design is generally used as a dampener for NVH (which we have found in the past to make very little difference). We have not tested this particular car's pulleys so I'm not sure. I agree that on this engine there is less gains to be seen with a pulley but I haven't seen any solid dyno sheet indicating either way (though the math indicates very little gain).
We have seen up to 8 whp on the VQ motors with underdrive and lightweight pulleys, but those are bigger motors with almost 5 lb crank pulleys. Also the 350's and 370's have PS pumps to underdrive so there is a little more power to be saved.
I also agree that there are much better upgrades that one should spend money on before looking at pulleys.
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