Vehicle modification

thumb|A Nissan Micra featuring Hinagiku Katsura from the manga series [[Hayate the Combat Butler]] thumb|A Mazda 3 featuring Yamato from the video game [[Kantai Collection]] thumb|alt=i|A Triumph Bonneville T100 featuring Flint from [[Girls und Panzer]]

automotive industry concerned with secondary parts

diesel engine modification to emit large amounts of dark exhaust fumes

American subculture