The stock suspension on my 993 C4S (42k miles) is starting to feel a bit washy to me; possibly it is worn out or possibly it is just my imagination.

Anyway, I am interested in upgrading the suspension to something more rigid/stiff. However, as I live in Manhattan I am not interested in lowering the car at all because I need plenty of ground clearance.

I use my car only on weekends (I have never driven to work) and I plan to do 2-3 DE events this summer.

I know people here like the PSS-9 kits, but those lower the car pretty significantly. What should I consider as an alternative that will not reduce ground clearance?

 

How about just getting the pss-9 kit and setting it to the USA ride height? There shouldn't be any problem with that.

With that ride height, you should not have any problems with the rear drop links being too long too.

Also, you may want to check your motor mounts also. I noticed a more controlled ride after I changed mine to the RS mounts.

 

There's quite a lot of discussion already on the boards on this. Some are even up to date. I suggest you do a search. But, you can start with this thread, if you'd like:

Best suspension for all around use...?

 

Another good one is Robin's suspension FAQ.

 

JPL;

Just install a set of Bilstein HD struts and shocks along with your stock springs and you'll be very happy.

 

Is there any break-in period required for e.g. new Bilstein HD's before pushing it hard, or is it OK or drive it more or less directly from the shop to the track?

 

Yes, and Yes.

You can drive straight to the track from your shop.
You should break yourself in, as the car will drive very differently. Perhaps a little "re-acquaintance" with your track partner is prudent before going all out, but I'm sure the shocks will be fine

Edward

 

I thought it was best to drive the car for a little to get the susp to settle before checking the alignment again (after initial alignment)?

I could be wrong (not the first time!)