I have the Roush Offroad exhaust kit and I'm ready to replace the muffler with something not so aggressive. I'd love something quiet while cruising but rumbles when I floor it. I may just get a stock muffler and go back to stock, but I love hearing the exhaust at WOT.

Towing is a little aggravating with the ROR.

 

Go for an 19" Borla ProXS, should tone down the drone under load.

And sell your ROR muffler for $100 or so bucks. Folks that want that muffler will pay for it.

 

Will the Borla be quieter than my ROR?

 

Yes it will cut down on the aggressive sound and make it smoother and deeper sounding tone

 

Since you asked for a more quiet sound I wouldn't have suggested a louder or equivalent muffler. The 19" case ProXS should fit your preference just right.