Generations

MY	Badge	Steering wheel badge	ECU	Build Date	MAF	BPVs	ESP	Transmission	F-hose	Notes
2000	[[Image:2000_s4logo.png	50px]]	[[Image:2000_s4logo.png	50px]]	A-Box	09/99-05/00	Bosch	710	no	6-speed	yes	Possibly Al uprights
		B-Box		Tiptronic	no					Possibly Al uprights
2001-2001.5		H-Box		06/00-09/00	Hitachi	710A	yes	6-speed	yes	Steel uprights, interchangable with M-Box but requires cluster recode
		J-Box						Tiptronic	no	Steel uprights, interchangable with L-Box but requires cluster recode
2001.5	[[Image:2001_s4logo.jpg	50px]]	[[Image:2000_s4logo.png	50px]] or [[Image:2001_s4logo.jpg						50px]]	L-Box	10/00-05/01	Revised TBB, oil inlets, sport package (w/Al mirrors) avail, Avant avail
		M-Box		6-speed, updated synchros/sliders
2002		[[Image:2001_s4logo.jpg	50px]]					T-Box		06/01-???	Interchangable with M-Box
			AA-Box	Tiptronic				Interchangable with L-Box

Notes

• http://forums.audiworld.com/s4/msgs/802094.phtml
• poll here: http://forums.audiworld.com/s4/msgs/2447926.phtml
• There is some confusion with cars near the 09/00 build mark

 # Some are 2001, some are 2001.5. 
 # Some 2001.5 came with h-boxes
 # Some H-boxes do not appear to have F-hoses (doubtful, probably incorrect report)

• The L and AA box information may be incorrect. Please mail me or post a comment in the talk section.