Does anyone have a Dynomax muffler on their ride, preferably the 5.4L? If so, could you tell me about the performance, sound, and cost.

 

Welcome to F150online !!
I have a 5.4 and a 3" exhaust with an "Ultra-flow". It's a medium priced muffler; mine came in a cat-back. It's a straight through design; you can see through it end to end. At idle it's mild, on the highway it's about as loud as you could stand on long trips/conversing/hearing music, but it really growls under a load at certain rpms. It's definately a throaty muscle car sound for those that like relatively loud systems.

 

Go to the Dynomax site. They have a super turbo, ultra flow and the stock exhaust sound bites for the Expedition. that may help give you an idea anyway. By the way, my Force II Flowmaster growls when pushed but virtually disappears at 70-80 mph...no drone.

 

does anyone know how much hp/torque I should see with a dynomax ultraflow 3"si, 2.5"do. How does this dual setup compare with the force 2 from flowmaster?