Completed by Shadoninja (http://shadoninja.tumblr.com/post/59922946277/mario-kart-wii-toads-factory-piano)
https://www.youtube.com/watch?v=F9i3tVM0iRg
Composers: Asuka Ota & Ryo Nagamatsu
Oh my goodness, I love this song! Someone needs to make this happen in sheet form!
Shadoninja did an arrangement of this a while ago. You can find it on his site here (http://shadoninja.tumblr.com/post/59922946277/mario-kart-wii-toads-factory-piano)