Dont forget the huge list of stickers! Each one baby, 5 hp instant!
And its called a header, since only one section through the exhaust gets channeled out. Only V6 and above cars have Header"s".
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille