I have a 2014 f150 with a 5.0 and 3.55 gears. When I first purchased my truck I bought a banks monster exhaust followed by the resonator delete and 5star tunes. And boy did I love the sound on her. Except on the highway she had some drone. With winter coming I put the stock resonator back on just so I wouldn't annoy the neighbors with cold start ups. For a while I enjoyed a little bit quieter of a truck. Instantly though I felt like the pedal didn't feel as heavy. I was always told the resonator is just for sound. About a month has gone by and today I said the exhaust is to quiet. So I took the resonator back off, screw the neighbors lol. I took it for a drive and I feel like my butt dyno is telling me that the truck is quicker. I know the f150s exhaust is free flowing, but is it just me b/c the truck is louder and I feel like it pulls harder or does the delete make a difference. I had one of my best friends in my truck and he said it felt quicker too.

 

After I took mine off it felt a **** ton better, specially on first get up.

 

Me thinks your butt dyno needs to be re-calibrated. The resonator is straight through so sound is the only thing that will be affected.

I took mine off with stock exhaust and the only difference I can tell is a little more exhaust note and rasphy at WOT.

 

The resonator is flow through. The thing that it takes out is the pulse that causes drone. It simply lets the exhaust gases expand into the packing before going back to regular diameter pipe. Sound plays a role in how something feels. That's why a drag strip is one of the best tools to use. That and a dyno. Takes the senses out of it.

There's a thread on here that has the scientific stuff about how an exhaust system works. Like the scavenge effect that people confuse with needing or not needing back pressure.