The Procharger belts should not slip as they are tooth belts, but they do wear.
The rattling is not good and if a C2 then it will be self lubricating.
However no great drama as I have plenty spares as I used to run a Procharger C2.
Lots of new and preowned pulleys in stock to chose from.
Also I have 1 new Procharger C2 head unit (blower) that I kept as a spare.
Just drop me a PM if I can help further.
All parts are in stock and good to go same/next day.
Regards,
Alex.