My 1st issue (serial #1) Stage II for auto 2.4 is installed, Hahn is explicit on copyright, but I do not think Bill means I cannot answer an installation question. Took about 12 hours total, and I'm patient and methodical. Pretty easy, and if anyone questions the little blanks in install exactness in the directions, they had better hire it done. Nuff said there. In short, the system is beautiful, and well thought out. Anyone with a garage, the proper tools and knowledge of the english language can do this. If I wasn't in Central NY and winter, it would be road tested tomorrow.