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In Mario Kart Wii, when using a Star or a Mega Mushroom / Thundercloud, your vehicle's base speed will be set to 105 and 95 respectively, ignoring the original speed
However, unused data suggests that the speed increase was not a fixed value originally, but +25% your base speed:
The Wii U version of Mario Kart 8 contains an unused graphic of a Red Yoshi riding a red Mach Bike!
This is a modified image of an existing Mario Kart Wii render, with the green colors changed to red. https://t.co/A7gADyc9Bl