FINALLY someone is making engine tuning software for the Xterra (several other nissan models as well). This has the possibility of making a nice difference in power and mpg, especially for the supercharged model. COBB has been tuning Subarus for a long time now (I drive an STi). Now my wife can replace the crap stock exhaust with a more free flowing exhaust cats be damned...since the COBB device takes care of any cels. I can't wait!!!!
That is the same place that has done some of the tuning for Xterraracer's X...I believe a remap of the timing etc., as it uses like 125 octane racing fuel....