At the end of the final race when Jake loses control of his car, just as it switches to the view from the front before the car launches into the air, you can see that Jake's 2011 Mustang GT has turned into a 2005-2009 V6 Mustang with the same body treatments.
When Kreuger is working on his car the night after racing from the party, his father does something to an engine and stars the car. He tries to start his car and nothing happens, but his car is standard, so he would need to press the clutch in while turning the key.