Welcome to the forum. There are plenty of things you can do to your auto civic. However I wouldn't suggest pushing it too far but I don't have much faith in Honda automatic transmissions. Cold air intake, cat back exhaust are the basics. Assuming you have the 1.8, there is enough support to get some toys and some noise going. The hondata tuner does work on the automatic but last I read it doesn't help the shifts. I was really only interested in making some noise so i bought some eBay junk for my 08 auto civic. If you do decide to get some bolt ons save your money and buy better quality stuff.