Hey everyone (with a Grado HF-2), so I was watching this video (at moderately high volume) while using my HF-2 and could hear this strange vibrating(ringing) in my right headphone at certain points in the engine cycle. It scared me a bit, but I could not recreate this ringing with any music that I have. I was going for songs that might have a similar sound in it, but couldn't find anything that really matched. I was thinking that it is possibly just an issue with the construction of the headphone, and there might be this one pitch that resonates in the earpiece. The noise was at a high frequency, so if you are older, you may not be able to hear it, and please let me know if you are.
For everyone else, listen to this Pagani Zonda R. It sounds amazing. Looks pretty good too.