Pick your Escudo.
Change the settings to make it do the wheelie.
Go to the Seattle II track.
After the starting line, there is a corner, you have to hit it at at least 180+ miles per hour.
If you hit it correctly,
-----------X
* * * * * * * |
* * * * * * * |
* * * * * * * |
You should get behind the walls in the level. You can go visit the stadium if you want, or the Seattle Needle too.
Once you get behind the walls, there is pretty much no ending to the level. So you can get your Escudo going REALLY fast.
Anyways, here is the topic at Gamefaqs message board:
Gamefaqs Level Glitches Discussion
And here is the URL for the page that shows exactly how to pull it off. Complete with videos and pictures:
GT3 Central
Good Luck trying it! I was a bit skeptical at first myself, but, I did it. It's really very odd once you do it.
(Edited by LiquidCrash at 10:50 pm on Aug. 10, 2001)