The Exceed Wildhawk /Super Lightning come with a brushed 480 motor, which is a 28mm motor can. If you want a direct replacement for the stock motor, you need a 28mm inrunner brushless motor and a 30A brushless ESC. Also, you need to decide how many cells Lipo you want to run, either 2S or 3S. If you want to run 2S, best KV motor is between 2700-2800 kv, whereas, if you want to use 3S packs, you want a motor between 1900-2200kv. I run all my EZ style planes on 2S 2200mah and they have ample power for brisk climbouts and aerobatics, for good power-off soaring performance, as these types of planes are gliders after all. Assuming you are in the US. Here is a good US source for a 28mm 2700kv inrunner for 2S use:
You will also need a 3.17mm adapter, and APC 6x4E prop for this setup.