Detonation Series
Toei's series of biker gang exploitation flicks.
Detonation: Violent Riders
Wild-hearted mechanic boy Iwaki falls in love with the innocent but gang tied Michiko.
Detonation! Violent Games
Teruo Ishii's West Side Story, done as a bloody, violent, sexploitative biker gang film. It's the Red Chilis versus the Black Cats, and the chick who just may heal the divide.
The Runaway Season
The third movie in the "Boso" series.
Hell Riders
The fourth installment in the Bosozoku film series starring Koichi Iwaki.