went pretty smoothly, had the sawzall out and what a pain int he ass it was to cut those 2 pipes....anyhow, it is one and sounds good, not too loud, just about right for me. actually, i was a littel disapointed on the sound at first, i was like "what the hell did i pay as this money for" but it is definitly getting louder the more i use it. fit was great, lined up perfectly and looks good. I am thinking about putting some bigger tips on it like those huge DTM's, that will make it look mean..J/K [headbang]