Altered is a former National Hot Rod Association (NHRA) drag racing class and a current drag racing chassis configuration that forms the basis of many classes of NHRA Competition Eliminator.
The altered is "[s]ometimes called the poor man's [d]ragster".[1] While the emblematic altered is a short-wheelbase roadster with exposed engine and front frame rails, very similar to the earliest rail dragsters, altereds can be bodied cars also.[2][3]
By definition, altereds were essentially stock gas, alcohol, or nitromethane-class cars with parts removed or changed, making them ineligible for the previous class, such as Keith Ferrell's Dogcatcher, a 1936 Willys sedan delivery; built as a gasser, Ferrell deliberately left something off to run it in B/Altered.[4]