Hello guys, welcome back to Mario From Nintendo, and you know what this is all about.
10. Chain Chomp
9. Heart
8. Triple Green Shells
7. Thunder Bolt
6. Mega Mushroom
5. Super Horn
4. Triple Red Shells
3. Golden Mushroom
2. Star
1. Bullet Bill
Also, honorable mention to the Fake Item Box!
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OCTOBER 2021 UPDATE:
https://mariofromnintendo.blogspot.com/2021/10/top-10-mario-kart-items-october-2021.html