Car Audio Subwoofers

This is my first demo of my new Sundown SA-8 v.2 after my box build. The box is 0.5cu, tuned to ~40Hz, sub is wired to 4ohms and is playing at 500w until I buy a 1000w monoblock. Its loud as hell for being a single 8" on 500w, and I'm no stranger to loud systems.