I had a dual exhaust on mine. It sounds good but I will have to agree with Joe_Black. When I 1st had it done I tought it would up the HP but a after really discuss with my friend who tunes imports he said that since I was having done after the converter it really isn't adding hp. So I decided to go back to stock exhaust for now til I order the PV Muffler from Tone. It all depends on who's doing the work. Mine was free since he is a friend and since I had a sticker with his shops name on my VX for advertising.