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If you don't need the flywheel weight to launch the car, I would go with the Aluminum version. Stroker/big block/auto- aluminum. Small block/small cubes/stick- steel. The more torque or torque multiplication you have available to launch the car, the more you should lean towards the lightest version available, aluminum shell/aluminum hub. ATI is definitely the best.

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This is my thinking but also heard that the heavier dampner actually controlls more harmonics........ The main thing is that I`m removing weight everywhere possible AND my dampner is 13 years old.