Mark, Anytime you open up a motor you will increase fuel economy. I learned this with big trucks running the same motors we run maybe a little bigger. Key is to drive them the same way and you did before and you will see a big difference. What happens if you drive it in a normal fashion the motor does not have to work as hard to do what you need it to do. On Dodge trucks the weak link is the drive train and transmissions are expensive. The Cummins can produce a lot of HP and torque and if you push the limits you WILL find the weak link.
Did you actually get numbers on MPG with the intake upgrade? MPG would be the only reason for me to go to aftermarket doodads...
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