Instructions
Turn on your PS3 and start up GT5.
Select GT Mode from the main menu to go to your GT home screen.
Scroll to the bottom of the screen and select the used car dealership.
Check the dealership to see if the ESI is in stock. If it is not, you will need to cycle through the dealer's available stock.
Pass five in-game days by entering five race events or license tests. One day will pass for every event you enter.
Check the used car dealership stock again. Repeat this process until the ESI appears in the used car dealership.