When Dallara, Stanzani, and Wallace began dedicating their spare time to the development of the P400 prototype, they designed it to be a road car with racing potential, one that could win on the track and also be driven on the road by enthusiasts.
Dallara, Stanzani e Wallace comezaron a dedicar o seu tempo libre ao desenvolvemento do prototipo P400, que deseñaron para ser un coche de rúa cun potencial de carreiras, que podería gañar na pista e tamén poderíase conducir na estrada polos afeccionados.