Definitely put them. They're toggleable, but if you get the 4pc 7color sets, the music activation is terrible. I just recently sold mine for a 3mil color extension. There's really no way to change the brightness, but their reds are always dim. The best mode would be the rainbow spectrum, sound gay but looks amazing. If you have a two seater, get a 4pc and put two lights under the dash and two under the seats, facing outwards. Everything depends on your car's setup. And ask me if you have any questions, LEDglow's instructions are incredibly vague and somewhat hard to understand.