Rated 4 stars only because I had some trouble tuning my vehicle and called Diablo twice first time was on hold for 50 min and second time someone answered after 55 min and told me everyone had went home for the day they took my name and number and said someone would be getting into contact with me the next day they never did so good luck if you have any trouble I figured it out myself .
2011 F150 5.0 Bully Dog GT Tuner
I've had Ford diesels since 99, so a tuner on a gasser is no where close to the value of a diesel tuner, but my truck has a 6" lift with 35's and stock 3.55s.The truck would only hold 6th gear from 68-70 MPH, so I got a tuner in hopes that a few more HP would be enough to hold it in gear so I could use cruise control on the highway. It did, and also my MPG has gone from 13.2 to 15.1 in the past 3 tanks of gas. The extra HP is noticeable, and I was able to adjust the speedometer for bigger tires
Avoid this Product
I purchased this after talking to AutoAnything and it has delivered nothing but issues. The communications is very faulty and tech support is horrible. I have sat on hold for hours and many emails but very little response. Now my vehicle is stuck on a program and burning extra fuel and I cannot return to stock and no one will help. So I would avoid this product at all cost and look for another programmer.