Its like Red07SSNA said , GM did away with the supercharger due to the emission laws. I think it was a great move since supercchargers take power to create power, most 4 cylinders dont have much power to begin with so there for it wasnt such a good design IMO. Turbochargers are able to handle the emissons and provide instant power when you get past a certain RPM. This is why GM saw better gains with the TC over the SC plus the other great designs and upgrades they made to the car such as the no lift feature and such. Superchargers should be left to the larger V-6's and V-8's since they produce enough power to run a supercharger. Dont get me wrong, I love the supercharged cobalts just as much as the turbocharged ones. Especially the way they sound like a little r.c. car with their whine.
Mod's So Far: AEM CAI, C.A. Header, 2.50 Magnaflow Catback Exhaust , ZZP Catless Downpipe, DC Carbon Strut Bar, Dropped on Progress Springs. Tinted, Fully Debadged, Custom front SS bumper,2 Audiobahn 10" w/JL amp, Lower Billett Grille, Sengen 18 x 8 rims wrapped in Capitol Sport UHP 225/40/18.