Mike in CA

SPASM relative to PASM on the 997.2 S: Front springs are stiffer and shorter, rear springs are stiffer, shorter, and progressive rate. Front anti-roll bars are the same, but rear anti-roll bars are actually a bit smaller with SPASM. I believe the dampers are the same, although it's possible that, being computer controlled, the programming for them might be different. At least you probably wouldn't have to replace the entire damper unit. No idea on cost, but don't see why it couldn't be retrofit unless there is some hidden parts issue (cosmically expensive computer piece or something) that would make it prohibitive.

iJeremy

The Bilstein PSS10 and PSS9 kits are the only kits I've found personally which are an improvement over the stock setup on these cars. Sure there are better options if you intend on taking your car to a complete track car but for the driver whom still spends most of their time on the street with the occasional track or DE day, you can't go wrong with the Bilstein setups. PASM guys are stuck with the PSS10's but if you didn't opt for that setup and don't need the Damptronics you can fit the PSS9's which are relatively cheap when compared to the damptronic stuff. If anyone is interested in pricing shoot me an I.M. with your model and options and I can go into more detail.