Guys,
Be advised of two important things if you upgrade to the Eibach's: make sure you do a wheel alignment and the camber is reset correctly on the rears to OEM specs. I had a situation where the performance shop did not reset the camber on the rears after doing the spring upgrade. This had the side effect of causing uneven wear on the rear tires over a period of time.
After about four months, I notice the car would start slipping on tar strips and crossing over the painted lane stripes on the highway in the wet weather. The problem got progressively worse over the succeeding three months. As we hadn't had much rain, I didn't really notice until a four-hour trip in the rain revealed how dangerous the problem had become. Once I discovered that the tires (which only had a total of only 16,000 miles on them) had the uneven wear, I had Kia replace them and reset the camber on the rears. Thankfully, that resolved all my slipping issues. But for a while there, it was very unnerving situation and scary when driving in the rain.
Be advised!
'sodo