Available as a coupe only, the SS Supercharged featured the 2.0 L LSJ Ecotec engine with an Eaton M62 Roots type supercharger and air‑to‑liquid intercooler. The engine makes at 5600 rpm and at 4,400 rpm. 18‑inch broad spoke wheels with P215/45R18 summer Pirelli tires were standard. Optional for the LSJ was a performance package coded G85 that added Recaro bucket seats and a limited slip differential (LSD). The G85 option continued in the LNF Cobalt, but added only the LSD. The car became notable for a high‑profile spoiler that was standard in 2005, but optional from 2008 when a lower profile spoiler used on all other Cobalt coupes became an option.
