Being a new product I wasn't content with having to upgrade the unit before installing it. I drive a Stock 04 Ram 3500 Long Box 4x4 with a six speed manual with 301,000 miles on it. I tow a 44 foot toy dump truck that weighs 17,000 pounds when loaded. I just can't believe the difference in horsepower and torque this thing makes with the addition of AFE's two-stage cold air intake. It's like going back to the day I towed my first camper trailer that weighed half as much as this one. I'm not a racer who goes faster than 65 mph. I pull my toy, maybe that's why I got 2.75 to 3.25mpg according to my truck computer, depending on how many Ford or Chevy trucks I want to overtake to climb mountain passes just to make them fly . me on flats that do 75 miles an hour. I look forward to installing my BD exhaust brake when it comes out soon. In the meantime, I will continue to drive my slow-moving 1985 Toyota Camry to work every day, as I have for many years, with a big old smile on my face, knowing that I don't need to impress anyone to remain happy to be feel good. happy. .