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The pulley (even with install and belt) is only a couple of hundred $s. And that the pulley will sell used for good money, and the M62 conversion will be magor surgery, and $3k-$4k..... Get the pulley installed now, and later, if you do this upgrade, sell the pulley on the marketplace, heck, sell the m45 SC in the marketplace.....
HAve the fun you can now, while the kit is being finalized. You won't regret the $.