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Doberman
Dobermann is a 1997 film by Jan Kounen starring Tchéky Karyo, Vincent Cassel, and Monica Bellucci.
As Christini kills Pitbull and abducts Nat with a car to rape her, Dobermann leaves his hiding place and follows him in a stolen ambulance. He overtakes Christini and manages to wrestle him down in the car.
Dobermann grinds the head of Christini on the road while still driving the car at high speed as revenge for the killed friends. Christini is left heavily disfigured on the road, presumably dying. The surviving gang members are able to escape and bury Sonia (the personage), suggesting that her treason results in Olivier having to drop his transvestite role.
As they leave the scene in their cabrio a police helicopter is shown following them, having them in firing line.