2000 magnum

This trucks get about 6 miles to the gallon and is just lazy my cousin has one and it is way better gets that 19/20 mpg. I cut the cat out and it was plugged help power some for sure. I was also going to order headers for it and dual it out it is a work truck of mine we only run it about 4 months of the year it hauls a 3000gallon sprayer around so I was expecting 15 mpg. It is low mileage about 160000km 100000miles I have a good maintenance schedule just changed plugs,wires ect stayed the same has lots of power out of the holes just very lazy at highway speeds the mileage is the biggest concern