You can't, each character has their own special vehicle. In order to use a vehicle not available in the level you want you need to enter a cheat.
yes but it seems inposible!
no
You can drive around, buy cars you didn't buy before and you can return to previous levels just for fun!(Or start new game)
Li'l Bandit
The padesterian cars do change into rich cars
the simpsons hit and run
My Computer > Program Files > Vivendi Universal Games > The Simpsons Hit & Run > art > cars > ambul.p3d
defeat all wasps cams.find all the gags,cards unlock all the cars and complete the races Bonus tip:for ps2 1.enter xoxo cheat in the options menu 2.go to phone booth and press l1 or l2 to get secret cars on another level plus new cars.
Star Cars - 2012 'The Homer' Simpsons LeMons Race Car 2-4 was released on: USA: 21 November 2013
You Unlock it
One can find cool paint jobs for cars by going to the Cars Direct website. The website describes different levels of paint jobs and what can be done with those paint jobs.
Angie