My favorite is airframe #3.
I have N.A.A. (North American Aviation) pictures from an early in my career that were recovered @ Rockwell Downey about airframe 66673.
https://airandspace.si.edu/collection-objects/north-american-x-15/nasm_A19690360000
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1980 911 - Metzger 3.6L
2016 Cayman S
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