I have a low mileage (55,000 miles) 2001 A6 Avant Quattro in excellent condition. Although the car is 10 years old, the rebound on the struts/shocks is fine. But with two BMWs in the garage I am used to a sportier ride and would like to improve the 'soft' ride of the wagon.
A couple of questions: What mfr. is the OEM brand for the struts/shocks?
What would be the recommendation for a replacement: Bilstein HD or Koni Reds? I want to keep the original springs and not change the ride height, so I think the koni yellows might be out.

Thanks for all your help.