Just an update on this. I called Banks and they said that the Exhaust will fit on the Xterra. He said however the reason that it is not advertised is because they feel that most people driving SUVs will not want the droaning in the interior. However, he said if you are looking for a purely aggressive sounding vehicle then this may be right for you. The guy said that the average they were seeing on the Frontier was an estimated 0.4-0.5 second drop off of the 0-60 time. I don't know if this is trye but this is what the guy from Banks told me.
I actually had a cat back on my 04 X and it was painfully annoying inside after the initial bliss wore off. But... I'd still do it again because it still sounds badass outside.
________ MEDICAL MARIJUANA