There are quite a few performance parts for these motors. They will never be a Racecar though, so remember that. A few things you can do include Tune, downpipe, midpipe, cat-back, port your intake, cold air intake, ect. Check out Bad News Racing dot net, they sell most of what's available for these cars.
Hello and welcome to the site! Glad to have you here. Show us your Cruze when you can. A lot of good info here regarding mods in case you are thinking of doing any. Check out some of the garages and you may get some ideas. Safe driving and Happy Modding!