98 v70 factory stereo: how to wire amp to sc816 HU

[CIK7]

As I said would, i raided a 98 v70 (glt) at the junk yard. I worked on tearing out a turbo from an 04 s60 T5, but the turbo would NOT come out and more bolts stuck in it. Anyway I also got a Bose sound system from an 05ish Mazda6. I am excited for the reveal of my car's transformation in a separate post. Anyway, I got a sub, 4 speakers, and an amp and need to know how to wire the amp and/or sub to the factory SC-816 HU. I want to install all new wiring from radio harness to speaker to amp. I do NOT want to get rid of HU unless necessary for sound quality.