Have a 91 Z28 with extended sound factory deck and speakers. Is it possible to upgrade to the optional Delco-Bose deck that was available that year and upgrade the speakers without any modifications or wiring changes? Is the radio wiring plugs that exist compatible fro the Delco-Bose and all the wiring for the speakers already done or is this not worth it and just go the route and purchase a aftermarket deck?

THANKSCaseybear