Guy making car sounds- 787B no joke
 

So the video on the whole is slightly corny, but this guy is UNGODLY good at these sounds, and he happens to start by doing a 4-rotor.

Guy Makes Car Sounds With Mouth Like We All Do But Much Much Better

The 787B is the first sound, jump the time to 0:50. IT IS SPOT ON! The echo is ridiculous.
The F1 car at 4:00 is pretty good too!