Quote:
Originally Posted by jmsremax
Aftermarket exhaust on your non-diesel? Personally I am a fan of the knocking from the diesel motor. There is no better sounds than a turbo diesel engine. Luckily I get to be a passenger on one every day (MBTA bus) VROOOOOOOOOOM!

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Nope it is stock. Ford's 2011 Super Duty's have an all new diesel and it is very quiet, no knocking at all.