Weird noise after autocross

[Stevensmatt60]

Just completed my first autocross and on my last 2 laps I noticed a strange fluttering chatter noise. Any ideas what it may be everything stock except no muffler and boomba bov adapter. Maybe kind of like a whine or whistle it was doing it underload. I had an hour drive home on the interstate and it seems to be fine now

 

[Phreak]

Was it coming from the engine, wheels or somewhere in the rear of the car?

Mine will occasional make a grinding squealing noise from the rear brakes after a hot run, but it usually goes away after about 5 minute or so

 

[Stevensmatt60]

Sounded by the front I was so distracted. I did notice it did it when I was on the throttle

 

[Stevensmatt60]

Heard someone's video from the last set of laps and it sounds like brakes squeeling buy when I'm not touching the brakes

 

[RAAMaudio]

Could be a boost leak or the bypass valved fluttering.