I wanted to bump this to the top, just in case there's anyone that hasn't tried the DSR delete yet. If you're like me, you find the random hunting and vague steering horrible on your S4. There are particular uneven sections in my daily drive, and my car would shoot in random directions on it's own.
I eliminated the DSR via VAG-COM this past weekend. What an amazing change! I immediately set out to the uneven sections of road to test it out. Dead straight. The steering has a very slight heavier feeling, and is much more stable at highway speeds. No vague feeling, and no random pulling to either side. It's still electric steering, so it doesn't have the immediate feedback of a good hydraulic system (I'm coming from an Evo IX), but it's quite a bit better than before.
Eliminating the DSR, combined with the CR-15 and AK, has given me the steering I've been looking for. I updated each incrementally. First the CR-15, then DSR delete, then the AK. Each mod had a subtle benefit upon the previous mod, and combined, the steering is vastly improved over stock.
If you dislike the vague steering, and haven't tried unchecking the stupid DSR, you should give it a try. Like everyone else, I got the ABS module fault code. It doesn't appear to cause any problems for my car.
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