JD_AMG

Bilstiens (and konis) were an option for these cars, so yours could very well be OEM stock.
Bilsteins are good shocks, especially for stock springs, but they are not really up to the task of dampening higher rate, lower springs (and will supposedly wear out quicker than normal then).
Koni SAs offer quite a bit more rebound dampening (will better control the higher rate springs with less travel) lasting longer and giving way better handling, control, feel etc.

redcamaro4140

iTrader: (2)

So should I get koni shocks

Randolph Ziskey

iTrader: (13)

I think you should give them a shot...I just recently went to the eibach pro kit springs and the bilsteins hd from the ones that came with the car...they were the standard orange and stock springs..I do notice a big difference but if these don't last like mentioned I think I will give strano and koni's a shot...I got a good $$$ and on a budget that's y I went with the eibach and bilsteins...If you have the eibachs then maybe go with something else...

38DD2436

I have Konis and Eibach pros on my DD. Couldn't be happier.

ThoR294

iTrader: (6)

Koni/Stranos here, and I love it.

High School Goat

iTrader: (1)

Eibachs on GTO's are known for killing shocks and struts.

redcamaro4140

iTrader: (2)

My dad stock 35th has blue springs and bilsteins shocks and everything else is stock I love the way it feels its also a auto and mine is 6speed