And even though many modern diesels are direct injection, they are super quiet. ( unless some idiot installs a tuner box ) The injectors don't give a single sudden burst of fuel like a mechanical pump, the give a few slight puffs to get combustion going then give the main charge.

Another bit of info on modern computer diesels. In tow / haul mode, they offer engine braking. Some of this is from the back pressure flap in the exhaust used for faster warm up serving double duty as an engine brake. The other bit is from altering fuel timing by advancing it far enough that the flame occurs as the piston is rising making the engine work against it's self.

Some will make a big fuss how their low power, leaky, stinky , inefficient mechanical diesel is the only way a diesel should be made. With modern controls there isn't much reason to live with these ills. People buy a _new_ vehicle for what it does right now not what it might do in 30 years.