What type of Line Output Convertor do I need?

I own a 2013 Mazda CX-5 GT with the Bose Audio

I know I need this I just want to add a subwoofer but otherwise keep the Bose untouched since it sounds amazing already.

Are there any tutorials online with how to wire the unit?

My Bose system has 9 speakers but no factory subwoofer

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