Oh, the Harvard is loud. I'm lucky enough to fly out of an fbo that houses 3 jack roush p51's. I have heard those things. I understand they are loud. I've heard them up close too. I can compare them to the 172's and seminole I fly. Is honestly say the 51 is louder, though not oppresively so. As such, I can clearly hear other things around me. I was fortunate enough to be ten feet away when the 51 started a runup once. I could audibly hear other things around me without issue.
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