I know what you mean, there are a couple of new Dodge 2500 CTD trucks where my son plays soccer. Several times they have passed by while I was siting in the car waiting for practice to end, and I did not hear them. It is odd, because the older trucks and even the new Ford PS trucks make so much racket that you can here them from a great distance. I really like the tock, tock, tock of the 12V's, it is addictive. When you pull up to a stop, there is no doubt that a Cummins diesel is present, every body has to turn and look to see what is making all that noise. I am sure their are many benefits to the quiet new diesel engines, and many new to the diesel world owners appreciate the silence. But for me the clanging and banging old 12V is like an old favorite rock-n-roll tune, It makes you fell good every time you hear it.