I added an Alpine KTP-445U. It connects to the speaker wires of the 130 and Power wire though I used a dedicated power feed. I made a wiring harness so I would not need to cut into the 130 wiring harness.
I would guess the 130 amp output to be less than 15w but could not find that info any where.
I don't think an amp will help much (or at all) if using stock speakers.