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I have a true dual exhaust, 3 inch stainless steel with 4 inch tips coming out the back. Y-pipe was cut off. Major restrictions, take 2 2 1/2 pipes crush them into 1 3 inch pipe.
That is how castrated your Hemi is.

I also have a K & N CAI, tonneau cover. I get 21 mpg Hwy and 16 to 18 city and hwy driving. All calculated with a chart.

But its hard to stay off the skinny pedal when the truck is roaring at both ends. lol. But what throttle response.

Looking into a tuner or programmer now to get better MPG and power.
 
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