PUZU Car DSP Amplifier #6 Plug&Play Harness for Mazda 3/6/cx-5/cx-7/cx-9/RX-8 (no bose option)
Amazon.com: PAC AOEM-MAZ2 Interface That Allows Replacement or Addition of an Amplifier in Select Mazda Vehicles Without a Factory Bose Sound System : Everything Else
Mazda 3 Service Manual - Audio Amplifier Removal/Installation - Entertainment