Great, DRC is a nice option to have and really makes the car a pleasure to cruise around in comfort and can be solid when you want some fun in dynamic, you also don't have any body roll through the corners. It's how the car should handle from the factory without having to upgrade anti-roll bars.
On the down side, it makes working on the suspension more of a pain, the DRC system is pressurised at 19 Bar (280psi) so removing the struts is a job for Audi only as they have the correct equipment for draining and re pressurising the system.
There is a way to work around it, it just involves a lot of jiggling and moving to get the front struts in a position where you can remove the spring without disconnecting the hydraulic lines.
My favourite setup with the OE rotor wheels was the ECS aggressive spacers (10mm rear/12.5mm front) and the Eibach springs. This gave a really nice ride, an improvement over the stock springs.
I had the Vossen wheels on order and with 21" wheels I wanted to go a little lower so fitted the KW H.A.S adjustable springs. With these springs fitted I needed to install the adjustable upper arms due to running a little too much negative camber.
This is my car with Eibachs and ECS spacers:
The KW H.A.S springs are nice and ride well but you need to factor in the extra expense of the upper arms to pull the camber out, the springs are already quite expensive so with the upper arms added in and fitting and alignment, it become a costly modification. The Eibach Spring needs no alignment other than a check of the toe angles after install and gets 90% of the lowering the KW's offer.
KW H.A.S fitted with ECS spacers
If you decide on lowering it, give me a shout and I'll put a guide together for you.
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