I don't know much about this Inferno Performance Package, and I don't know if it's the same thing as the Inferno Appearance Package on PFYC, but from what I see, it'll work, except for the Front Air Dam.

From their website, they mentioned

Fits 2004-2008 Grand Prix only! Does not fit 1997-2003 Grand Prix. Front Air Dam does not fit GXP.