Isnt the Crank pulley on the boxster as far as function, the same as other vehicles?
What i mean is usually the Crank Pulley turns belts which we all know, HOWEVER it also is a harmonic balancer for the crank... with my experience with bolt on mods on other vehicles, removing your Crank pulley/Harmonic Balancer will throw off some balance that the crank needs in order to prevent premature bearing failure... and by removing the Stock pulley and installing a lightweight Crank Pulley (which commonly do not have harmonic balancer atributes) can reduce the life of the bearings.
I would recommend performing an oil analysis before and after installing the new lightweight Crank Pulley to check for increased wear in the Crankshaft bearings.
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