If you can find part 2, it's just like having part one. The movie is about 90% flashback. Seriously.
Spoiler:The end.
The younger brother from the first film is shown as an adult in a therapy session, and he re-tells every long, boring detail from the previous story, and they show every long, boring scene to go with it. Then, in the last ten minutes, he kills the therapist, hits the street, shoots one guy and kills another by attaching jumper cables to his eyes and exploding them.