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any one hard this problem seems to knock from the front whenever i give it the beans.
i realise the solution to this is not to accelerate hard but i think itd be rude not too.
It is also possible for the exhaust downpipes to knock on the sub-frame.
I have this knocking you describe but have yet to resolve it. Mines a 04' 172 with 16k on the clock so would be disappointed if the engine mounts had gone.