...But any busfan worth their salt will love the sound of this Old Detroit Diesel 6v53, 6v71 or 8v71 (Not sure exactly which one it is)found in a City of Philadelphia Dump Truck. Emjoy!
http://www.youtube.com/watch?v=j5Ztagw1f7w (http://www.youtube.com/watch?v=j5Ztagw1f7w)