For the Genesis coupe, whats the difference with the 2.0L and the 3.8L?

[stacay29]

I'm thinking of getting a red genesis coupe but I don't know what the difference between 2.0 L and 3.8L is. Is it sorta like horsepower or what? Sorry, I don't know much about cars. And theres different kinds like spec, premium, rspec, grand touring, and trace?