My shocks were working as they should though, the front two were brand new and the rears were fine upon inspection when removed. They are there to dampen movement and that's exactly what they were doing... there is a clear difference in spring rate between the original springs and the Eibachs which I personally felt was unnecessary given the car has adjustable damping.
I'm almost certain that the SR/VR Eibachs are also listed for the 2.4D models etc, which don't have the 4C system - a little poor if you ask me - surely the R models require a different spring than any other model without 4C?
I didn't personally have the latest ECU update, but who knows what's been done to the car between '04 and '11. I reset the SUM as was required through VIDA and I felt that the ride was still too harsh. The difference between comfort and sport was minimal in terms of RIDE QUALITY albeit less body roll etc in sport mode. That's the whole point of a SUM recal, to compensate for the fact the cars now sitting 30mm lower. The car was fine before and was poor afterwards. If the car required an update, it would've driven poor before and after.
Although the >>>>SUM UPDATE<<<< may have helped in your instance, it will simply change the way the struts dampen the movement. In my opinion however, the added stiffness came from the SPRING not the STRUT, there was a clear difference after fitting the Eibachs and so surely an update to the SUM wouldn't change much?
It's only my opinion, people can do what they want, I didn't enjoy buying a set of springs that cost almost £200 to then remove them a few weeks later and sell them for a fraction of the original cost. They also make the 4x4 suspension look 10x better.
The roads round here are full of pot holes and speed bumps. This coupled with the fact that components such as drop links are prone to failure, I think those springs are a bad idea... IMO.
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