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I've heard this sound over the past few days but this afternoon I pinpointed the noise coming from the stock muffler. It sounds like a something is rolling around inside the muffler or a growling sound after I shut the engine off (after I've let it ideal for about 30 seconds). My truck (05 F250 CC 4x4) is only 1 week old and I have 1050 miles on the 6.0 motor. Any ideas?????
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.