Jwillis. Per my alcohol infused conversation last night. This really looks to me like it isn't your belt giving way, but the BPV was. Good thing you put that Bosch back on since you know it will hold boost. This dates back a while when we discussed that but you haven't had a chance to re-dyno with that one.
The bosch valve will not fail at any given boost amount (well within reason). Plastic is actually very strong and there is not enough pressure in the system to cause it any harm. However, where the problem lies is in the size of the valve. It is just too small to get all that air through it so with high boost it simply can not purge the amount of air the supercharger is forcing at it.
You will be fine in the short run with it though.
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