Regarding the pedal booster, I can agree with all the above comments and with a proper tune, throttle response can be improved etc. I am just giving it a try as I have a stock engine and was curious to see the effect. I don't have the same support and options with regards to the Raptor here in Australia. Driving now for 3 odd days with it fitted, what i am trying to describe is that it just gives you the feeling of more responsiveness. Makes the pedal more sensitive so to kick down or get off the line quicker, you don't have to mash the pedal. In effect it is like removing the lag from the human movement. I am happy with it and if I end up getting a tune etc I may remove it but having that perkier feeling is quite nice. After all it is a three and a half ton truck!