wooden swords, metal pipes, baseball bats and Molotov cocktails). Vehicles are known to modify their motorcycles in peculiar and showy ways, which are called . The general style of bike modification appears to combine elements of an American chopper bike and a British café racer. Examples of modifications that are taken from these styles are raised handle bars like those on a chopper or over-sized fairings like those found on café racers (though usually fit them much higher on the bike than their original position, and angled upwards at the front). A typical customized bike starts off by taking an average 250-400cc Japanese road bike, adding a exhaust system (multiple tube header), squeezing the handlebars inwards (known as , from the verb , "to squeeze"), and adding a 3 or 4-trumpet horn- or , respectively. Loud paint schemes on the fenders or the gas tanks with motifs such as flames or kamikaze-style "rising sun" designs are also quite common. The bikes will often be adorned with stickers and/or flags depicting the gang's symbol or logo. There are also marked regional differences in motorcycle modifications. For example, Ibaraki are known to modify their motorcycles in an extensively colorful, flashy way. They will often have three or four oversized fairings in a tower-like way in and an abundance of lights. In America the term "Bosozoku" is also applied to cars that have undergone extreme modification. The term generally only applies to Japanese manufactured vehicles, and is somewhat interchangeable with the term "Kaido Racer". Broadly, "Bosozoku" refers to the concept of Japanese vehicle modification, whereas "Kaido Racer" refers specifically to car modification. Ties to organized crime In general, the Japanese government sees as highly organized groups, affiliated under several national federations. They are known to be surprisingly well organized, despite generally only having a handful of members above the age of twenty. They also generally have clear cut rules, uniforms, symbols, and other marks of organization. Certain groups even have membership fees and set punishments. These groups also make up a large proportion of Japanese criminal activity, being involved in vandalism, road traffic violations, and other criminal activity. Their lives of crime generally do not end after they turn twenty though. It is estimated that around 25% of are above the age of twenty. Alongside that, they have been shown to have ties to various yakuza organizations. In fact, some numbers predict that