well I have both right now, 11 av with 5.3, exhaust, air intake, superchips tune, love it. 11 escalade 6.2 RWD, week after I got it lifter broke @ 70k, replaced cam, lifters, V-loom, timing chain, oil pump, tuned with superchips, both AFM delete. Both run great, the 5.3 gets about 2-3 mpg more over 6.2