and I like the interior. I hope no one butchered the one you saw 
What are those little gas-cap-looking things on the seats?
Speed holes. They each add 10 horsepower.
I think they are design only, not really sure to be honest.
I correct quote is:
Homer: [suspicious] Hey, what are all these holes?
Salesman: [quickly] These are speed holes. They make the car go faster.
Homer: Oh, yeah. Speed holes!
----------------------------------------
Homer, meanwhile, uses a pickaxe to make some speed holes in his own
car.Ned: Whatcha diddely-doin', neighbor?
Homer: Aw, putting speed holes in my car. Makes it go faster.
Ned: Is that so? Well, gee, maybe the old Flanders-mobile could use some