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BGM ~ Don Flamenco - Punch-Out!!
I actually went back to Mario Kart Wii! This was super fun to make, and it was awesome to get to talk to members of the MKWii TASing community after a long time.
Anywho, I'll break down how this glitch works. If you clip the front of the finish line pole at just the right position, you can pass through an invisible wall that normally stands above the side of the road. Upon landing, we can use Rapid Fire Hop Abuse to pass through the zipper. I had to use a lot of QM manipulation to get a wheelie while going through; otherwise, you don't have enough speed to make it across to the other side. However, on the final lap I managed to get a trick off the zipper while rotated to the left, which allowed me to avoid having to Rapid Fire Hop to avoid hitting the wall after passing through the zipper.
I'm decently satisfied with how this turned out.
-Lap 1 last trick can be lower.
-Lap 3 zipper glitch is about ~.2/.3 seconds faster
Therefore, I think a low 52 is the best time I could get right now on this course.