Welcome to the forum! Probably the biggest change you can make is getting a tune. The BNR tune gets pretty high praise around here. Which transmission does it have? Feel free to ask any questions and enjoy your Cruze!
Welcome! As for performance, a tune is going to give you the most bang for your buck and depending which one you choose, could improve your fuel economy as well. One thing you can do for free is check your spark plug gaps and also run premium fuel.
Hello and welcome to the site! Congrats on your Cruze, share with us some pictures 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!