Sales and Professional Installation of Car Stereos, Audiophile Grade Car Audio Systems, Car Alarms, GPS Navigation, DSP tuning, 3M Window Tinting, Radar Detectors, Subwoofers, Amplifiers, Speakers, Boat Audio, Harley Audio, Truck/Auto Parts/Accessories and more. Concord Car Stereo's staff has over 90 years of combined experience in Mobile Electronics, 3M Tinting and Auto/Truck Accessories.