Just got an '11 gmc crew w/ 6.2 and get 16s with normal driving interstate/around town combo but have to say power is pretty impressive out of the box and tows like a champ , I pulled Pegasus up to Louisville in a 24 foot and it was awsome. I'm wanting to do a tune but all I'm reading is even with a custom tune the best they are getting is a 15Hp increase due to not being able to do much with the 6 speed auto , or the factory torque management but would definately love to hear options
Traded in an 08 with 5.3 and it is a huge difference , more than was anticipated
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