I'm interested to know if there's much to be gained out of these Gen IV trucks without going to forced induction. My truck is a 2009 Tahoe 4X4 with the 6.2. I've already had the POS transmission replaced once under warranty and I do have a good relationship with my dealer, but they gag at the thought of another 100-150 HP through the stock drivetrain and honestly, I'm a little leary of the required tuning. I bought a flashscan a little over a year ago and went through a LOT of different BB tunes. I've never been 100% satisfied with the results, but it does run better than stock. I have a K&N in the stock air box with Airraid tube. From my seat of the pants dyno I'd say I picked up at least 30HP and it walks a stock Esky easily, but I want more. I've considered headers, but I don't want the noise. What could I get from a cam? Head work? What is the difference between these truck 6.2's and what's in a Camaro? Is 450 HP possible on pump ( Ca. 91 ) gas?