just a little point to throw in here is that we've had problems with our bmw customers and a decent amount of others that have broken bearings inside the motor as well lost their motors because they've used different crank pulleys
the rotating assembly is balanced from factory with the stock front pulley so by changing it you essentially "unbalance" the motor...not to sure how this effects the 370s motor because in some cars this doesnt cause any issues for the most part
but just something to keep in mind...
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