Trifecta tune is good as a hondata tune for hondas. Its a generic street tune to recognize your PCM's metric efficiency flow chart. They have pre-programmed air/fuel charts that range through your whole rpm band. Will you notice a difference? Slightly, that is, if they take off the "learn" ability, otherwise, if they dont, then your PCM will revert back to the way you drive.
I would look at instead of a plug and play little hook up, a shop that offers PCM dyno tuning. You can talk with them directly of what your wanting to get, plus they will pull it on the dyno and you can see for yourself what its really pulling, not a website's claim.
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