chopped

A chopped vehicle has had its roofline sectioned horizontally, with material removed and the remaining portions welded back together to lower the overall height. This is done by cutting the roof posts (the vertical supports between windows) and removing a section typically 3 to 8 inches depending on the desired drop. The roof panel itself is then lowered and re-welded to the shortened posts, creating a distinctive proportional change to the vehicle's profile.

The practice originated in 1930s hot rod culture, where it served both aesthetic and aerodynamic purposes. A lower roofline reduces frontal area and center of gravity, improving high-speed stability and fuel economy on stripped-down racing builds. Today it remains primarily a custom car modification, most commonly applied to older trucks and classic coupes where the structural integrity of the frame can accommodate the welding work.

Structural and practical considerations

Chopping is structurally invasive work. The roof posts and sills carry crash loads and provide rigidity to the entire frame. Cutting them requires precise calculation to maintain safety, and poor execution can create flex in the chassis or weak points in a side impact. Windows and doors must be re-fitted or fabricated after the cut, as the door openings change shape. Headroom is reduced noticeably, and some vehicles become impractical for daily driving once chopped significantly.

The term is sometimes used loosely to describe any lowering of a roof, but proper chopping involves structural sectioning rather than merely lowering on a reshaped frame. It differs from sectioning, which is the removal of material from the side of the body (typically the doors or quarter panels) to lower the overall height while keeping the roof intact. A vehicle can be both chopped and sectioned in a single build.