I know...it's dirty, shatap. I used 4awg for my power wire(not hooked up in the photo). It has run two a/b amplifiers simultaneously that were fused from the factory for a total of 170amps. The output was ~"2000 watts RMS". The wire never became warm to touch. I don't think I ever really pulled more than about 35amps continuously either.
I recently measured my newer install which would amount to ~"1200 watts rms" and 80amps fused and it came to around 110db A weighted and 120db C weighted. The new amp is a 6 channel and class D.