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I have HPTuners and I love it. Granted it isnt noob friendly but if youre really interested in tuning, just buy some books and teach yourself. Thats all I did and I consider myself pretty good as do a lot of people I tune cars for. I just got my OBD port working so I dont have alot of time invested on the tune for a Tahoe, but I did read and save the stock tune and noticed there is A LOT of potential in the tune alone. I like it cause you change everything on a laptop, not a 3 inch screen like some handheld tuners. I think its a lot more detailed. JMO
this works for me... since i bought my tahoe last month i have been spending my whole life in this forum! I am already addicted...