I do love this pinwoofer-kit as well. Installed the super-kit (amplifier and boxes) a couple of weeks ago in my EHOH premium and the result blows me away. I am really, really happy about it. Sound plays now in another league.
Due to that experience I ordered today the kit for my IMDN and WillyWonka. The external subwoofer from today is after the installation of the kit for sure history.
I can recommend Dan from Pinwoofer as well; very sympatic person. Perfect communication and support; he answers all your (even stupid) questions. I do like this customer orientation. Thumbs up!