3" in/out, center inlet, offset outlet.
Resonator removal will result in drone when the MDS kicks in.
The resonators are not restrictive and I'd leave them on. You will still get the sound of the muffler but no drone. It will be a bit quieter than if they were not there but you don't want the drone!
Take a look at the link below for some representative info on a single in/single out system for your truck.