defines a car that is kept on the road despite visible heavy wear. Restomod: Classic cars that combine original exterior styling with modern applied technologies (such as new suspension, wheels, transmission) or modern interior features (multimedia etc.) for comfortable everyday use. Siren kings: A New Zealand Pasifika subculture where cars or bicycles are modified with loudspeakers or public address systems for use in competitive battles. South London look: Subtly modified 50's-70's British Fords that are lowered, with pastel paint and 13 inch Lotus Cortina steel wheels or RS, Minilite, or Revolution mag wheels. These cars often use a tuned Ford Kent or Pinto engine. Slab: Originated in the Houston area since the mid-1980s—usually, a full-size American luxury car is fitted with custom "elbows", a type of extended wire wheels which protrude out from the fenders, loud speaker setups, and neon signage inside the trunk panel. Other "slab" modifications include hydraulic-actuated trunk panels (a "pop trunk"), candy paint, vertical stainless steel trim on the trunk panel (known as "belt buckles"), aftermarket grille, and the use of a Cadillac front-end sheet metal conversion. The interiors of slabs are usually clad in beige or tan (in what is called a "peanut butter interior"). Usually associated with Houston hip hop music. Sleeper: Stock-looking cars with performance upgrades. Stanced: This style is mostly associated with sports and passenger cars with lowered suspension setups. Custom wheels with low-profile tires play a large role in this style and often feature aggressive sizes, offsets, and camber. VIP style: A Japanese style of customizing luxury cars that evolved from Bōsōzoku. Glossary Legal requirements Many countries or municipalities have legal requirements which govern vehicle modifications. For example, all vehicles in Victoria, Australia, must conform to construction standards to ensure vehicle safety. There are also restrictions for P Plate drivers which can prevent young drivers from driving modified vehicles. Many developed countries have smog regulations, which generally forbid any modifications to engines or related components unless the modifications themselves are certified, like production car models. Such modifications, even if they do not actually result in increased emissions, prevent legal use on public roads. Sanctioning organizations Various organizations involved in competitive motorsports such as the FIA, SFI, NHRA, and IHRA, amongst others, act as sanctioning bodies to establish safety guidelines for racing events, series, tracks, vehicles, and parts. The FIA is the largest international motorsports governing body, with FIA certification being required