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one of the accessories has a slow bearing causing it to slip and get tossed under really HIGH engine loads.
Tell him drive it like a normal person driving a big body suburban and not a vette.
Should be obvious whats going on.
i would check all your pulleys with the belt off. check the pulleys to see if they are clean and with no damage, check the tensioner (even though its new) for cracks or looseness in the housing. with the belt on look across all the pulleys to make sure they are all straight. the problem may only be slight so check it all twice.