There are a ton of threads that would help you in the Performance and Fuel section. I couldn't find the thread where BlackBear performance dyno'd several CAI so I found it on another site. I bet you'll rethink spending the money for volant and go with just the AirAid mit and a drop in filter for a lot less money. Just the AirAid tube out performed the volant so think what you will get throwing a K&N filter in too.
http://www.gmfullsize.com/forum/showthread.php?p=5045477#post5045477
http://www.gmfullsize.com/forum/showthread.php?p=5045477#post5045477
