belt slippage ?

if the belt is slipping on my supercharger is it loosing power?i had it dyno with new cat back exhaust it made 10more rwhp 10more rwtq,but it made max power at 5k rpm and stayed the same all the way to 6k.theres alot of dust on the supercharger and it sounded like the clutch slipped on the dyno,it probably was the belt.the clutch is brand new.



2000gt
p1sc 10#
03 cobra tank and pumps
42 lbs injectors
prom universal
frpp 3.73s
frpp aluminum driveshaft
mac catted h pipe
bassanni catback
370rwhp 412rwtq