Well I've now bothered to look up the regs, and I do stand corrected.
"5.5 Differential and Final Drive Assembly:
The action of all final drive differential units, including those within AWD transfer cases, is free. The rear
cover plate of the final drive assembly may be replaced by another mechanically identical unit.
"
From
CAMS Manual
You can always contact someone via the racing website if truly interested in finding out (
http://www.pcaa.com.au/index.php).
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Current: 135i Auto, Le Mans Blue - w/ Bridgestone RE-11 rears, GP Thunder 7500k angels, & "golf tee" mod plus a few M3 suspension bits and pieces...