SCORE Class 5 is described as "open wheel unlimited Baja Bug class that competes in the SCORE off-road race series races including the Baja 1000, Baja 500, San Felipe 250, Baja Sur 500 and the SCORE Desert Challenge. The Volkswagen Beetle, or the "Bug" as it is nick-named, was one of the earliest types of vehicles to compete in desert racing, and the heritage of the Bug continues in several different classes. Class 5 was originally the class which allowed the most modification of a stock Volkswagen for racing, and this was given the "unlimited" designation. Other VW Beetle derived classes that are still in existence are the closely related Class 5/1600, which limits engines to the 1600cc VW air-cooled type, and Class 11, which is for stock VW Bugs. Vehicle Description While the rules theoretically require that a Class 5 Unlimited vehicle must be built from a vintage VW Beetle (or one of the closely related stock vehicle originally made by Volkswagen or Porsche), in practice most of the current vehicles competing in this class have been constructed around a chrome-moly full tube chassis. The original VW bodywork, or in some cases fiberglass VW facsimile body panels, are then attached to the chassis. The rules require that the finished vehicle resemble a "Baja Bug". The Baja Bug is a much-loved icon of an earlier era of desert racing. Engine Originally, and for many years, engines were required to be 4 cylinder VW air or water cooled engines, other main manufacturer of these was Porsche, a company closely tied to Volkswagen through shared design and heritage. By the mid 2010s these large displacement air-cooled VW-type engines had become difficult and expensive to acquire and maintain, and a number of racers active in the class began the process of working to enlarge the list of available engines to keep the class alive and reduce costs for those competing it. As a result of these discussions and negotiations a decision was made to allow any production based 4 cylinder engine of 2500cc or less to be used in the class. The rules still permit the use of unlimited displacement VW air-cooled type engines. The Chevy EcoTec 2.4L and 2.5L engines are now the most common engine in the class, but engines from other makers are also being raced. A Class 5 Unlimited buggy built around a Subaru boxer 4-cylinder motor has been