2001 996r Stretta engine, 998cc ohlins front and rear, carbon belly pan, V piece, side panels, air box, chain guard & number plate holder. 4 pads calipers Not sure if they had a carbon seat unit. All other 996 2001 models were non stretta.
2002 998r stretta engine but bigger bore, 104mm, shorter stroke, 999cc. 3 BHP more according to Ducati. Ohlins front & rear, Carbon belly pan, V piece, side panels, air box, chain guard & number plate holder and a smooth seat design in carbon.
996 discontinued now called 998 with various flavours of stretta engine for the BP, S (bip and mono)
www.ducati.com has pictures and specs of the variations.
Ray.