S4 Owners w/ No R. Sports Differential .. are you having fun?
The S4 with the SD is a totally different car than one without it after I experienced the SD system off. If you are purely a drag racer of course you are not going to notice a difference but if you like taking your corners fast or tracking the car or some that are in cold weather climates will appreciate the system.
You don't have to push the car to it's limits to take advantage of it... I can feel it on 90 degree turns in everyday traffic.
If not for performance reasons, then get it because an S4 with the differential will hold it's value much more than one without. It will essentially pay for itself if you ever decide to sell your car.
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MY s4 is my daily driver. Auto and Nav were a must. SD and MT and forget the NAV if this is your weekend racer but that's not what an S4 is about IMO.
Non SD handles great. Test drove one with sport differential but without nav. I chose the nav without sport differential. While I do feel the steering in the non SD is a little light, I think it can be adjusted through the VAG software. The sport different felt artificial and a little unpredictable on the street. I simply preferred the nav over sd and didn't feel strongly enough about the SD to wait for an order.
Regarding resale, I think most S4 enthusiasts will prefer to have SD. Everyone else will be indifferent. Ask the average BMW guy if he has heard about the sport differential. At trade in time through the dealer (Audi or non Audi), you will be better off without the SD. Look at any used car value book, you will get much less back then you pay. Dealers simply use the check boxes. All other things being equal, an SD vs non SD will be worth a few hundred dollars more. Not $1K more and certainly not more than that. Agreed, selling privately, I think SD will be more marketable today as the few S4 guys will be seeking it. 4 years from now, nobody will care. Still an S4 and great car.


