Shock options
 

What options are there out there for shocks? Is it only Bilstein? What about koni drop ins, can the strut housings be modified to make them work? I haven't been able to find anything online. I'm trying to find a shock for Autocrossing in stock class

SCCA opened up the rules fairly wide in 2014 renaming stock > Street. About any shock/strut can be used providing it has no more that 2 adjustment methods and the mount points are the same as the stock part, and the perch is the same relative position as the stock part. That should allow K-sport , D2, Bilstien's, and almost any other shock/ strut that is a bolt in replacement.

If the rules are open enough to allow for a coilover that let's you adjust ride height, go that route. Setting ride height and getting the car corner balanced will go a long way to making the car right for you. As well, I recommend doing the GT3 front sway along with a stiffer than stock but not-too-stiff spring set up.
You know I like my K-Sports!!

They did open the stock rules up but you still can't change the springs so coilovers (the best option) is out.