I'm not exactly sure where to post this, since I used a Wii to test out my hacks and since the Wii has Gamecube support...mind as well post it here.
This was done by modifying offset 0x18 in the course data BOL, and this value stores how many laps there are in the race. 1, 2, 3, 4, 5, 6 and 7 all work, I have not gone farther but I don't think Lakitu has a graphic for a 8th or 9th lap. I don't think the times list will support it either. But you never know, I'll look at it later.
Enjoy
This was done by modifying offset 0x18 in the course data BOL, and this value stores how many laps there are in the race. 1, 2, 3, 4, 5, 6 and 7 all work, I have not gone farther but I don't think Lakitu has a graphic for a 8th or 9th lap. I don't think the times list will support it either. But you never know, I'll look at it later.
Enjoy