If its a 2.5...well that's maybe normal !

If its a 2.0... something went wrong filling or it has a issue that requires attention.

You have given very little info, how many k's ? what is your set-up ?

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MY99 WRX EJ2.35L 720whp 9.48@147mph
https://youtu.be/c_lYEG0_Dyo