It's Bosozoku style. Has kind of an interesting history in Japan. Lot of it is tongue-in-cheek being over the top but some of the stuff is very creative.

The style is also associated with bike gangs. When I was in Japan they would often drive by crowded shopping areas just pegging the rev limiters/trying to be loud as possible. The exhausts are just as ridiculous as the cars but it's kind of hilarious.

A lot of the car modifications are based on the old Japanese Super Silhouette race series.


Like this Skyline....