its quite simple actually.cheap ones give crappy results.
but it also depends on the intensity...like 6000k ones are white-ish sumtimes muddy like u mentioned.the 8000k ones are the clear ones.if im not mistaken.
im having problem wit my turbo... im thinking of changing it to the original stock turbo... how much izzit? wher can i get one? wat if i wanna change the turbo to another kind of turbo? which one is recommended?? thanxx