When your take off in first then change into 2nd does the car/turbo sound normal? also does it make any squeal noises when your in 4th and put your foot down then change into 5th?
Where you running your aircon at the time and how many kms since its 100'000km service?
* Just noticed your running a FMIC, might be worth checking all your silicone pipe connectors for a vacuum leak.
This could explain the noise, pressure in fmic pipe work is higher in 2nd/3rd gear so possibly louder?
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1989 Legacy GT --> 2001 GD WRX --> 1999 GF8 WRX --> 2001 GD WRX
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