I wish I could hear turbos! But due to to much turbine whine, 10,000 rounds of 308 and 223 a year, and riding a motorcycle with no ear plugs(wind) I can no longer hear turbo whine and I wish I could. My hi freq. hearing is so bad I can't hear brake squeal or wear indicators dragging or engine ping due to bad gas. The last turbo I could clearly hear was my 99 F-250. It sounded like a jet landing on the roof! Then I bought a 2000 F-250 with a different turbo and goodby whine. My wife and kids could hear it! The 300SD is silent as far as turbo but I can sure feel it. I can still hear knocks/slaps which sucks.