Yes Bilstein gave us the same #'s also. It's supprising how much they differ. I don't think that the local product reps get very good info. Testing your actual springs at least gives you a difinitive starting point, should you not be happy with the outcome, changes will be easier to determine.

I'm sure that the GMG springs are right on, as they are directly involved in their development.

 

I know on the 996 turbo there were two versions of the Bilsteins. One Euro and the other for the American market. Maybe it's the same for the 997 turbo?

 

Going to have a local shop do the install and four wheel alignment.