so there are options for you. as the car is aging there have been new info and tech.
for what is out there, coding and tech.
coding:
can be done at the dealership. this is a hit or miss. meaning that some audi service centers may not even know that is this possible. so you could become frustrated getting them to first understand this is possible with their computers and then getting them to want to learn how to do it. think, government and how long it would take them to pass a new law and start practicing it.
as far home coding, it doesn't exist yet. we may need a different system and its very costly to buy to even do it ourselves. vcds does not seem to allow us to do this yet.
another options is going 3rd party coding.
i wouldn't go 3rd party as it is pretty sketchy and i have heard of some people getting hosed and its not worth the headache.
the cost is there in case your calculating it. it is not free. since this is a service that your paying for there are no refunds. so if there are problems or there is no final satisfaction. such as it didn't do what you wanted, then your stuck. also when you go back to stock or even get different springs you must recode it. even if its the same product or height you would want to recode it. with that, you have to repay for that service again. keep doing it enough times it will cost a lot more than you would have though.
tech:
there are new tech that can help adjust this now. you would just buy the hardware and install. its plug-n-play.
one that comes to mind is the DSC sport system.
magride controller tuner system
price is there and is not cheap either.
i prefer the is over the other even when the other is lower in price.
why, the ROI of the product.
not exactly accounting by what im saying but let me explain.
when you buy a service, you don't know what your getting till its done. even if they describe it, your not sure if it will turn out right.
your also finished when they are done with their service. you cant resell that service, if it doesn't work the way you like, after your done with it, or if you decide to change your mind down the road.
again, if you change out different springs you can do this adjustment at home and as many times as you like.
with an actual piece of hardware, you can sell it at anytime.
you may loose a little of your initial investment but your still able to get back most of it.
another thing with this particular product, it allows you to also choose setting. as a coding service does not. this unit says it can zero out your parameter to the new ride height then do other settings for stiffness and such.
i hope that helps.