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Restriction: The MBRP have 4" downpipes not 3.5 so you do get a good reduction in back pressure and lower EGT than a Walker or even Muffler delete.
Droning sound: With the units that have a straight thru muffler like the MBRP and others the direction you mount the muffler will effect this. The official way to install(which is for outside sound reduction) is with the scallop fins or cuts facing into the flow or toward the front of the vehicle. This way they cause disruption and reduction in the sound at the tail pipe. Unfortunately this way which seemingly causes large flow disruptions ends up giving may that drone ( or in cab sound increase)sound at cruising speeds. Turn the muffler around so the fins /scallops face downstream or toward the tail pipe. You will get very little disruption which will cause slightly louder sound outside at the tail pipe but will in most cases greatly reduce or eliminate any droning in the cab. As someone has already said the X being a SUV body it is mroe prone to hearing droning if it does exsist. This is because the muffler is directly under the Cab and why the less you cause flow disruptions ( to a point) the better it will be in the cab. Hope this makes some sense and I didn't bungle it to bad trying to explain what I mean.
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