Lock is a bit of an exaggeration. Rather, the connections are not meant for third parties and therefore you need an ISO adapter cable with CAN-BUS interface to install a universal radio. Unfortunately Digitec doesn't offer such a thing, so I'll point you to the link below to see what you need: http://www.ebay.de/itm/RADIO-ADAPTER-KABEL-ISO-CanBus-Interface-fuer-FIAT-Grande-Punto-Stilo-/321160545443

As long as the vehicle has a 1DIN slot and ISO wiring, I see no problem. However, I cannot judge whether this is the case with the Chrysler Crossfire. However, it looks very much like 1DIN, and ISO is standard on almost all vehicles,