I pulled a little weight off the truck tonight. 
I wasn't expecting a huge change with all the cats and resonators.  Just a little deeper/louder growl at idle and with a little pedal.  Cruising down the highway I can't tell much change.
If I let it kick into eco mode, there is an ever so slight drone that goes away with a little volume on the tunes.
I wouldn't mind a little more, but for the time and cost I'm happy.  This is mostly my family camping rig.  I already have a Plymouth they don't like riding in...  I'll admit though, the Plymouth kinda gets me with the low speed drone.  Almost hurts my teeth.  I'll fix it someday.
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