They do and I have had the draxas setup now on mine for a few months and the difference in the low end pull is sweet! Even with a magnaflow flex back and the headers I haven't had any problems with the cops and the noise.[race]
you will feel more power in the top end, it opens it up a bunch .... much improved . But you really don't feel too much of a loss down low either . Its a good header but if you plan to go with an agressive build I suggest you go with the cossie header. it has a lil larger larger primaries .