Here is some comparitive weight data for the stock parts in my MC and a 92 S4 vs JE pistons and Carrilo rods. (Thanks to Michael Pederson for the additional data):

ITEM	Custom weight(grams)	STOCK(grams)
rings	Total Seal: ????	29
5kt MC Piston 81 stock 82 custom	380	384
S4 AAN pistons 81 stock 82 custom	279.5	355
5kt MC Wrist Pin	120	129
S4 AAN Wrist Pin	87.5	106.5
S4 AAN Con. Rods custom steel?/titanium	533.5/415!!	657

Carillo(?) Titanium rod for a vw gti vs the stock rods for an S4 AAN

custom JE Pistons compared with the stock Mahle pistons.


Note the large cut in the top of the piston... almost wish I would have made it not quite so deep so as to raise the CR just a little bit.