And a surprising number of cars from the late-1960s to today featured either factory louvers or have extensive aftermarket support for them. You can even make your own with enough time and skill.

A company in England is building kit cars that take after an iconic rally car from the mid 1970s. You can also build it yourself. Here's what you need to know.

Window louvers are those horizontal slats you see a lot in some cars from the 1980s and prior, along with more recent muscle cars like certain Mustangs and Camaros.

The governing body believed the two teams had altered their hood louvers on the #31 car driven by Justin Haley, as well as all four cars from Rick Hendrick's organization. Ad.