[steved0x]

I emailed with koni and they said as long as you are not riding on the bumpstops alot you should be ok with Special Active and lowering springs. Let me see if i can fund it.

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However, the FSD/Special Active dampers do not care if you have OE or lowering springs at all, but to work properly you do need to do your best not to allow the car to impact the bump rubbers very often during normal use. Since they are non-adjustable though it is best to not increase the spring rate much more than that of the factory rates or they will become under damped, though I do not know of any company currently making a stiffer factory ride height spring.
If lowering with a aftermarket spring ,although it does no damage to the selective damping system, a harsh, high frequency impact into a bump rubber will be seen by the system just like a high frequency road surface impact and it will be in blow-off mode to allow the energy to be un-damped for a smooth ride,. Since normally a bump rubber impact needs more damping control and not less, the car may likely feel under damped when you spike the bump rubbers hard (this will happen more often with the lowered suspension. Because of this, it is very important for proper function for the car to a keep ride height and spring rate combination from allowing too much bump rubber contact. While it is not KONI’s preferred combination, (Sports would be best option for lowering/stiffer spring) it does not harm the shocks, it just may not give the same amount of comfort and ride quality control you would normally get with the FSD/Active’s with OE springs

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Certain applications which have been ride tested have been approved for use along with the Eibach Pro Kit lowering springs, as mentioned earlier it takes a bit more testing than the adjustable Sports due to the frequency selective feature. Some applications such as the Mini Cooper, and C5/C6 Corvette we recommend only the factory ride height if using the FSD/Special Actives. The 986 is an application that our engineering’s have not yet done any lowered ride height development on, however the springs rate increase is very minimal if the numbers are in fact correct for the Eibach’s. The question then would become how much bumpstop does the spring use. If you are able to keep the car off of the bumpstops as much as possible with the lowering springs, it’s very likely the combination would work just fine.