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I don't have a 6.0 (have a 7.3L) but recently installed a 4" Turboback SS from MBRP on my EX. Install was staight forward, like the sound inside, and did notice a small difference in perceived response/power. This is "straight thru" although a "muffler" is installed (you see daylight when looking thru the muffler however).
Only thing I notice outside the vehicle is that the Turbo Whine is noticable now. Turbo wind up is a bit faster as well. The "noise" level is probably different but I don't hear any "frone" at highway speeds although I have cut the length to place the 5 in tip further inboard od the rear wheel.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.