Why not take the LNF from a new Cobalt Sport. Or install the GMPP Supercharger kit. That's what I had on my cavalier and it was just as fast as my GXP was stock. After I had a pulley, injector, intake, exhaust, and tune done the car was a 12 second car. Added nitrous for that last second drop off. I got rid of the car because the cavalier is hideous looking and cant turn or stop for **** without a lot of work. My brother has been enjoying it now. Haven't put the time or money into the GXP yet, payments have been hurting me.
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The Festas!
1964 Chevrolet Corvette
2004 Pontiac Grand Am SE
2006 BMW K 1200 R
2007 Pontiac Solstice GXP