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7.3 will be loud with no muffler unless you leave all the resonators on. I have the MBRP system on my 22 7.3 and it is loud enough for my taste with some slight drone around 2000 RPMs. The MBRP removes everything behind the front resonator and has one straight-through muffler.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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