Lots of them - examples include the mount of cameras, longer landing gear, etc. The first thing I do is cut off 90% of the foam - leaving just enough to cover the main board and center. Some people replace the bearings. Some pics of my cut and the camera mount here: https://www.droneflyers.com/talk/threads/wl-toys-v262-quadcopter-first-look-and-review.217/
