PAC ROEM-GM21 System Interface Kit to Replace Factory Radio and Integrate Factory Amplifiers for Select GM/Chevrolet Vehicles Designed To Replace The Factory Radio And Keep The Sound Quality To Its Full Potential Retains factory audio system functions Uses factory harness, no cutting System interface to replace factory installed receivers and integrate factory amplifiers Adjustable 4-channel RCA outputs that provide Line Level Matching Isolated transformer inputs and outputs Trigger wire included For select GM/Chevrolet vehicles