Instead of risking a download from a shady site, the safest way to get a compressed version is to do it yourself using your own game backup.

: 32 total courses—16 new "Wii" tracks and 16 "Retro" tracks from previous consoles.

Here are some popular websites to download Mario Kart Wii highly compressed:

Generally not recommended for storage saving, as they take up the full 4.3GB or require conversion. 3. How to Obtain or Create a Compressed Version

Before downloading Mario Kart Wii highly compressed, make sure your computer meets the system requirements: