Ask around on the BBand see if anyone in your area has a Efi Live V2, and they will usually help upload a tune for you, that way all you will have to pay for is a tune Lic $125 and what ever Black Bear charges for their tune.
As others have stated, and as I have found also, my wifes 17 with the 6.2 is rather anemic, If I needed hers for pulling Id spend the money on one, but dont need two...
If you truly want power for these things get a duraburb, they are quite expensive, but with a duramax in them they are bad ass, better mpg and the pulling power of a diesel.
My wifes 17 Denali battery had to be replaced after only 18 months and 19k miles, local GMC dealer said they they have to warranty them all the time nowadays, I agree with Doubleleive, Optima batteries are not what they where 10 yrs ago. If I recall there are actually only about three or four...
As a mechanic by profession, at idle 5 psi is fine, there is no working load on the engine, also food for thought , today's eng mfr's have transitioned to high volume oil pumps
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