I've wanted to do TASes for this game for a long time. However the emulator for Gamecube isn't very user friendly when it comes to TASing at a higher level. That and the fact that my knowledge of the game wasn't the best have kept me away from this until just recently!

I focus on flaps for now. 3laps in a TAS would be very repetitive with pretty much the exact same driving for all laps. Initially I planned on completing 4 flaps before making this post, but as the physics in this game isn't one of the simpler (duh), I decided that 2 were enough.
https://www.youtube.com/watch?v=o6nCgz1N6lc - BP flap
https://www.youtube.com/watch?v=OivZxjovxEc - PB flap

You should know that they aren't very optimized in terms of what is possible with the use of TAS tools. Memory watch is way too tedious to use at such a level that I'd wanted so I stuck with only frame advance and save states. Also naturally, knowledge in this game is a huge part of being able to accomplish a solid time - with or without TAS. Therefore I'm quite sure there's some "kart logic" errors here and there.
Also, if you've watched the old TAS of the All Cup Tour you'll notice that you can't do build MTs as fast in TT. I think this is good as the fastest MTs here should be possible to perform in real time and the TAS gives a nice look of what it's like to continuously make frame perfect such.
If you wish for any specific flap to be TASed, let me know. Or... make one yourself

I'm sure many of the top players of this game would do wonders in a TAS almost immediately due their massive knowledge; I'd be more than happy to give some basic instructions for how to get started if you feel you need it.