I seriously think it’s best not to think how cars reproduce. Although I got a bad feeling those sick freaks at rule 34 will answer that question for us shudders.
…I’m not touching this one!
you really wanna know…?Ask foriegnconcepts… 
Well, I believe Mater made a reference to his mother in the original Cars, not to mention the fact that The King has a son, but as for Johnny_Boy’s comment…it’s probably something very unoriginal anyways. 
The King has a son?
Well they never come flat out and say it, but he has a wife and always calls his “son” Junior. Here’s what I mean…
That isn’t his son! That’s Dale Junior! A famous racecar driver making a cameo! 
I’ll be darned; I didn’t know that!
Hahaha, I love Junior! I have a poster of him on my wall! In human form, not Cars form.
He’s my FAVORITE!!! 
Ha, I know right? He’s so cute! ! ! <3
He is!!
Mine three! I <3 him
I think it’s somewhat like Robots, where they order and construct their kids. If that makes sense…
Funny you should say that. I thought that too.
#88! Aww yea!
Yeah, I’m thinking car children are ordered and manufactured. My big question is though: do they grow? Or perhaps, are they just “born” in full adult form?
They do grow. It shows that in the movie. That little girl is a tiny version of a car that looks like a mix of the two adult cars she’s parked between. So they would have to get bigger.
She’s purple and the two cars were red and blue. Red and blue makes purple.
I wonder if they get new parts or the medel expands.
The metal probably expands. When a car talks, it’s bumper and hood move around and, depending on the letter they say, let’s say, an “A”, their chin will go down. This stretches their metal. Which makes me believe their metal stretches.
I’m such a Cars nerd. I know.
I was just about to say that. Haha, you sure have put a lot of thought into this movie.
Not really. Just used my eyes. 