Classic Ford Mustang Sound System Modernization graph.org

The centerpiece of any sound system modernization is the head unit. Fortunately, companies like RetroSound and Custom Autosound have engineered perfect solutions for 1965-1966 Mustangs. Their "Retro Sound" radios, such as the M2 model, maintain the classic AM radio appearance with authentic-looking knobs and chrome trim while packing modern features including AM/FM stereo, Bluetooth connectivity, USB ports, auxiliary inputs, and even hands-free calling . One forum user reported successful installation of a RetroSound unit in their '65 Mustang, noting that while FM reception was initially weak inside the garage, it improved dramatically once the car was on the road . These units are designed as direct replacements for the factory radio, fitting the small instrument panel opening without modification .