Hi, it's perfect with the DB killer. In my opinion, you can't use it without the DB killer without getting a headache, so I definitely recommend it. For the money you won't buy anything better.
With the panniers working normally this is not a problem. Rather, it's noisy for my taste. The sound is awesome, beautiful brutal, but noisy. Delivery took 5 days, but they make them in the country next door, so the journey was not long.