Yeah like the other guys said, it really depends if it'* a Series 1 or 2 L67 (3.8 */C). A series one would come from a 92-95 vehicle (in almost all cases, I think the Buick Park Ave retained it a bit longer, not sure), wheras a Series 2 would be from a 96+ vehicle. The Series 2 really has more aftermarket, and it'* a lot easier to swap to a better supercharger with the S2, as there are a few direct replacements.
PS I bet your Sunbird will go like snot once it'* done eh?
1990 Pontiac Sunbird LE 2.0L OHC - 5 spd - 96HP!!!!!!!!!! - 35+ MPG - World'* Ugliest Hubcaps - Sunroof - Alpine deck..........0-60?.......YES!
1994 Pontiac Bonneville SSEi Gone but still in the family...
Pics... Pics...Pics...XM Install...