Can I beat Gran Turismo 4 WITHOUT BUYING a single car?!

Hello friends, welcome back to the impossible challenge series! Today we're going to tackle one of the most legendary racing games of all time, Gran Turismo 4, and we're going to see if we can beat it without buying a single car!
Those of you who are familiar with this might think this is impossible, but we'll just have to see about that!
Music included:
Music from #Uppbeat (free for Creators!):
uppbeat.io/t/g...
License code: QFVZBDO1FXUL0HPE
"Monkeys Spinning Monkeys" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons...