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If you google the supercharger couplers there are a large number of complaints going back to when the this group of cars were new. Many owners were complaining that the couplers were rattling at idle. Many had wear of the couplers in short order. Evidently the couplers have springs that compress and release at idle and create the rattle. GM said until now no problem but I have to give them credit that they are now covering. Looks like new CEO is catching up on all the past problems and taking responsibility for repairs, a good change.
Other makes/models that use similar superchargers use different couplers. I have heard there superchargers running and they are very quiet. My car is OK though.
I will be looking for letter and will be very happy to receive.
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