It's not the supercharger. Most engines do this. The 4.3L in my S-10 did it; the duramax in my Silverado did it; the 3.4L does it; my friend's GTO does it; and the N/A 3800s do it.
2004 Impala LS - got some mods sold!!!
2009 Subaru Impreza WRX STI
NAIOA moderator Still Imp'n, just in a different Imp.