im running without projectors in my alero and I have 0 issues with performance wise, so does my GF's neon and my buddy's g5. I own the 35 watt kit and 55 watt kit. my 35 watt kit ( for low beams ) is 6k's thats the color I love and amazing performance. as for the 55 watt kit I got 8k's because the extra power that it putout gets rid of the blue thats in it so it makes it seem like 6k's.
as for the dual in and dual out, its perfered to have those kits because they mean they were made better the ones without them I have owned once before in my aurora and I had a few issues here and there with them.
www.ddmtuning.com ( check it out )