Well if you make a kit for the NX make it fit right. I had the VR$hit exhaust system and it fit like crap. I thought I was the only one then my friend got his kit and it fit the same. More money out of my pocket later and it's just all right. here is what it looked like after the install.
Mine was 2.5" my friends was a 3" and fit the same, rattles on a bolt that holds the exhaust heatshield in the rear.