I'd like to add an aftermarket sub and amp to my '05 legacy LGT with dual climate control. I was hoping to be able to tap in to the under seat sub to make it like Gozilla and King Kong back there thumping.
You would need a line out converter. The best way to do it is with a JDM dash kit so you can install whatever radio you want and wire it up the correct way. I've never been a big fan of line out converters.