I like the new R20 shifts are perfect and fuel Econ. is better. I wish the turbo lag would B less. Espically on the 100 HP tune. Lets face it If I wanted fuel Econ with a 100 Hp I would b crazy. keep the 65 for econ and soup up the 100 for black smoke tire burnin fun! Thanks for constantly working ...

Im new to the forum but im on my 4th superduty truck. I currently have an 06 with the R20 tune and have the same Problem You do. The sputtering is due to the direct injection module not being able to compensate for the new tune. I started my truck in Sub- zero weather and noticed that switching to ...