don't know about the marking
don't know when exactly the cutoff was between the 221 and 220 types. there was a lot of sticker goofiness going on in 92. the option codes don't always match the cars. i've seen quite a few of them with options not listed, and some listed that are not there. i think it's because the US market was not originally slated to get the 92, but sales were slow overseas, and some cars got sent here. some of those had to have things changed to meet DOT and such. some cars got stuff from the parts bin and they didn't update the sticker.
as for the quaiffe, i have no clue how that one is made. i've only seen one car with it, and that one was noisy, so i don't know if it was working right. what i do know is that the torsen and the guards both spin the wheels opposite, like an open diff.
94 Midnight Metallic Blue Cab Porsche 968 w/deviating cashmere/black interior and WAY too many mods to list - thanks to eric for creating
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"It isn't nearly as expensive to do it right as it is to do it wrong."