Does anyone know? If you know of a supercharger for the Q by 4, let me know what company it is and how much it costs...Any personal experiences would be appreciated as well.

You'd have to go custom, but the new maxima's are 3.5L as well so maybe you can fabricate a maxima 3.5L kit (when it comes out).

There is a supercharger available for the QX4, in fact I have it installed on mine. The kit came from a NY company called 'Kennedy's Dynotune' and it costs $3,200. It pulls real hard on the highway, definatley added a lot of missing power...
e-mail me for more details: insanium@insanium.net
here's a pic of my engine:
http://www.insanium.net/DCP_0987.JPG