I've got a stainless steel stromung dual tip. Had it since end of may. Really nice sounding. Good, bassy tone. Very growly sounding. Definetly cool. I like the sound of it a lot better than another calgary club member who has a 5zigen fireball. I don't find the exhaust is that loud, comparatively. I don't think there is a difference between a single or dual tip. The dual tip looks wicked because it fills up the bumper notch and isn't really super noticable in the same way a huge single tip is.