I bought an Airaid JR kit, and Throttle Body Spacer last week from Summit racing. The CAI tube would not fit due to lack of clearance from the resivor in front, even though it said would fit 2007-2011 Chevy Tahoe 4.8, 5.3, 6.0L's.
The Throttle Body Space fits, and with some patients the stock intake can be put back on (tight fit). I just put it on Friday night, haven't went any where to determine gas mileage change +/-. I Will keep you posted. I have seen people put the Volant CAI on, but I didnt want to spend $300-$400 right now.