Believe it or not, I am a huge gamer, but I really wish so bad that it was a BeamNG mod (since there are tons of existing mods already. The Duramax add-on mod may be close but still got nothing on the FM4 sound). I do know that it sounds an AWFUL LOT like the then-new Ford 6.7 Power Stroke (cuz a 2011 in 2011. But in a crappy-good way lol)
Yes, in case if you guys aren't familiar, here's what I mean. The sound was not only in FM4, but continued through FH2 (the X360 version) actually.