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
Worth the $$$$
I purchased this tuner because 1. Good price 2. Limited options for my sport trac 3. Adjust the speedo for bigger tires "32's". It has definatly added some pep to acceleration and shifting seems smoother. I've only ran "regular gas" tune so far, but will be switching over to "premium" to compare hp/tq gains. Overall, very pleased with my purchase and would buy again.