Ok as everyone who has an R/T and a Predator knows, the 5.7 badly needs a Diablosport Predator performance tune to wake it up. And oh, my does it wake it up now. I just got mine out of the garage last week and updated the latest tune file from Diablosport to my tuner and then loaded it into the car with the added new feature of a throttle boost option which I increased a mere 10% (out of a possible 20%). The difference between the stock factory tune and this new tune, forget it. No comparison at all. Today I was doing 30mph and after the engine was warmed up I gunned it and had wheelspin followed by being slingshot down the road at 80mph a very few seconds later. The low end torque in my R/T with the 93CAI tune and the other mods I've done now feels just about on par with my buddies '08 SRT8 Challenger and the top end seems a bit more powerful and aggressive than his 100% stocker ride. Stop after stop the car starts going sideways with just a little bit extra foot in it. There seems to be with the latest 9r28 tune over the 9r23 tune more low end grunt, more useable midrange power and maybe a tad more top end. I'm also running the tune with the MDS off and the shift firmness increased. And it was like 40 degrees out today. My wife's reaction to driving it today was like "Hey our Mustang ('07 GT) never ran like this. This is crazy!" After today I don't think she'll miss her beloved 'Stang as much anymore.