Just picked up my new 07 GMC 2500HD :D NBS 4x4 ext.cab with the 6.0L gasser and the new 6 speed auto. Anyone know of what aftermarket performance parts there are out? I've spent 3 hours searching the usual places and come up with squat. I am looking for a cat back exhaust, air intake kit and ecm upgreade or programmer. Would love to remove some of the torque management, but dont want to leave any evidence behind in case I need to take it in for servicing. Dont want to lose the 5 year/100,000 mile powertrain warranty.