Bullydog's hemi plus tuner works awesome in my opinion. I have a 2011 ram 1500. I ran it hard in a stock 0-100 km/h (basically a 0-60) and clocked in at 13.54 sec, didn't catch my speed. After the bullydog tuner install, and a cold air intake I ran it again, 9.83 sec... That's without the true dual on there now. I will run a test again next week. As for mpg I'm averaging 14. I do mostly hwy driving
Oh, should probably tell you, this isn't in a hemi! It's a 4.7L!