2009 Pontiac G8 GXP (415 HP, 6.2L LS3 Corvette V8 & 6-Speed Manual Trans.) This particular 1 has a modified suspension and wider, deep dish rims and sport tires. I personally would have gone with matte black rims, dark tint and Holden Front Facia.
A G8 (2008-'09) in. Los Angeles Police Dept. livery... hadn't been aware, there even was an Enforcer (PMD's traditional name for its police/fire service-specific models) program involving the GM Holden-sourced model. OTOH, given the relatively wide use of the Holden-built Chevy Caprice PPV in N. America to date, that's probably not truly surprising either.