But as production of the Biguà—renamed the Mangusta—began, the relationship between De Tomaso and Qvale soured; Qvale took over the car and rebadged as the Qvale Mangusta.
Pero a medida que comezou a produción do Biguá, renomeado como Mangusta, a relación entre De Tomaso e Qvale agreouse; Qvale fíxose cargo do coche e rebautizouno como Qvale Mangusta.