I currently have the nissan sport exhaust installed on my '01 se. I like the looks of the exhaust plus the nissan replace the h pipes with new stainless ones. So you need not worry about it rusting. As for the horsepower well I thnik there is some more there but not a huge noticeable difference. Now you might notice more on the sc but I dont know. Then the sound is a slight rumble that I personally like but some may think it is to loud, considering the X is not all that sound proff. Hope this helps a little.