Though few Baja Bugs are built anymore since the creation of tube-framed, purpose-built buggies known as sand rails and the shrinking supply of early Volkswagens, they remain a popular choice in the desert since few beaches in the US are open to for use by cars or motorcycles. Many are fitted with highly modified Volkswagen engines and a few have engines from such cars as the Ford Pinto, Chevrolet Corvair, Porsche, Mazda, Subaru or other four- to eight-cylinder water-cooled engines. Fancy Baja Bugs for use only on roads remain popular as well.