Rear subframe has no bushes, locked solid to the chassis, but the bang is defiantly from the front, like under the drivers feet towards the centre. I have never been able to see any marks etc under the car but i read somewhere on pwrx about this before.

You have to either have serious hopping in the front when launching or be under super hard abs braking, where the car jumps around, so not under normal driving..

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Version 6 STI