Yes mine is a six speed. I had been having trouble with the first 2 gears because they are so short. I would stall it on occasion, very embassing! The chip reprogramming seems to extend the range of each gear a little longer. It runs out stronger in each gear as well, seems to pull harder. The other thing I noticed was on the highway about 90 mph. Befor when you would give it gas, it seemed to hesitate a moment before it took off, made you want to downshift. After the mod, you give it gas and it instantly responds. The shift point are longer and at a higher mph. These are my impressions, nothing measured. thanks