Oh, race him. You can beat him.
4 seconds sound clip from the American Graffiti movie soundboard.
You can hear this line at 01:14:06 in the Blu-ray version of the movie.
Quote context
[...]
- Your car's uglier than I am!
- Come on, boy. Let's go. Prove it.
- Oh, race him. You can beat him.
- Hey, doll, why don't you come on, and ride with me... in about 10 years?
- Now, leave her out of this. This is just between you and me.
- Wow. He's really fast, isn't he?
- Any of you guys know a blonde in a white T-Bird?
- I'm trying to find out, you know, who she is.
[...]