I have the InTune and I can tell you this, that mutha halls now. I have used the diablo tune that is for 93 octane, and I am using the 91 tune now. For some odd reason I had a few times where I had spark knock using Shell 93 gas. I have never had an issue before with Shell gas, but I did with that tune. I would try using BP, or Sunoco, but I am a Kroger card member and save on either Kroger, or Shell gas. I filled up the other day with 93 Shell I had a dollar off and it was 3.119 after the discount. Anyways, the 91 tune is good. I asked the question on the DS forum and this is what the guy told me.
Gains depend on a lot of things..
MPG booster is not designed around power gains, but MPG gains.
87 tune will add about 15 rwhp, 20 ft/lbs
91 about 15-20 rwhp, 20-25 ft/lbs
93 tune 20-25 rwhp, 20-25 ft/lbs.
I tried and tried to jump on the gas and see what would happen, before the intune. I would get a chirp. Now, when I jump on it I can lay a patch of rubber about twice the length of my RAM. That is a 4x4 Quad cab with 3.55 rear end,lol. My advice is DO IT!!!