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Is it possible it just refers to the different ratio options (Option 1, 2 or 3)? ... or (just to prove I know nothing) S1 is 5 speed S2 is 6 speed?

See here:

http://www.osgiken.net/products.php?product=other

and a new 6 speed is $17k from the Aussie agents:

http://www.otomoto.com.au/c/4488746/1/os-88-sequential-gearbox-and-parts.html

Plus clutch, plus cross member from what i remember last time we looked......

Can be found cheaper locally if you know who to ask.

Ok,XKLABA that was the answer i was looking for.I knew they changed something.Do you know what year they changed series?The series1 is probably still an excellent box but worries me spending big coin on a superseeded product.Do you know what the internal modifications were?Bigger shafts,gears,dogs????

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