Hacker15e
Who am I? Where are my pants?
I always thought you had to have that endorsement or training letter for a P-51? Cool. (Not doubting you, as I recall you have some flight time in WWII airplanes)
You are right, actually, because of the Mustang being ex-military and having an engine with greater than 800 hp. It does require an ETR.
Maybe a T-6 is a better example of an airplane that legally you could go jump in, but a sane person wouldn't.