Calvert Racing offers a 9-way adjustable for $238 a pair for your car. I believe they may be made by Rancho for Calvert. I ran the Rancho on my Challenger with SS springs and like using the softer setting for normal cruising and the ability to firm them up at the strip. Previously, I had the KYB.

http://www.calvertracing.com/store/cr-series-9-way-adj-rear-shock-cr22142-sold-as-a-pair-p-77.html