Whistle noise on hard throttle on a yz450f

Has anyone encountered a weird whistle noise when accelerating hard on a yz450f, it can be heard when blipping the throttle when stationary or on the go.I wasnt able to find any thing on a search.

The intake seems to be sealing fine and a mates wr450 does the same.

YEP..It is the exhaust..

I just fixed mine.

I had to take the header pipe off and looking threw it from the inside i seen a small hole / crack.

The aluminum mounting flange that holds the pipe on was covering it up.

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