Cheers! I've pm'd him. I wouldn't push my current engine any more than what it's going through at the moment considering its current condition. I go though about 7L of oil between changes at 10,000km intervals and tried all sorts of thicknesses and additives. Symptoms point to the piston rings.
As for the airbox I thought you could swap in the 2.2 or 1.8 airbox and get the same effect? I've seen it in other forums before I think.

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