get it booked it in asasp, does it pull to one side, loosen you hands on steering wheel and see, tell garage everthing, may or may not be related to the knocking. Talking of which, had a look in my boot and the key thingy that holds the wheel in place was well loose, so tightened up.
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MR200 Stage 3 200PS
Evans Halshaw
Mountune Pro