do you have any issues with noise with these?
We have had a fair few UK guys complaining about noise from the mounts. This was with Tein Flex on their IS's.
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Been kind of busy but I always try to find some time to check in. I don't always have time to post though. :(
Colin is dead on with the noise issue. The metal pillowmount in the Flex better connects the driver to the road. It does give better feedback. The downside with road feedback feel is that noise comes with it. When I went from Flex to CS, I did not like the drive experience since the CS feel was so muted. This was good noise-wise but bad for drive feel. After some driving though, I got used to it and feel that the CS is a better match for a luxury car. The handling is still pretty good. It is deceptive since there is less feedback. Deceptive or not, though, the Flex is definitely a better road carver.
As for the SS, I am surprised that it would drive as nice as the CS. I guess it depends how they build the shocks portion as there is no specs on this for comparison. Looking at the spring rates, though, the SS are pretty stiff. The springs are along the lines of the old HAs (and even stiffer in the rear) which were stiffer than the Flex. I can't imagine it riding as stock as the CS can. I can't say for sure, though, as I've never been in a car with the SS.
It would be quite a feat for Tein to build a coilover that is cost effective (vs the Flex and CS), carves up the road (based on the spring rate), while riding like OEM (depending on how the shocks are valved). I can give them the first two points but I will need to test out an install to see if they were able to achieve the last since the shocks would also have to overcome the stiff spring rate. I would doubt it, though, since I think everyone would be on SS instead and I have not seen a movement to that with other GS owners.
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Having had Tein Flex, Tein CS and Eibachs...
Hands down the TEIN CS are the best option..