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Honestly the ride felt smoother then stock surprisingly, and the install on 1-10 scale was a 5, but you will need a spring compressor tool.

Here this guy made a DIY on it
http://www.forteforums.com/forums/do-yourself-articles/1803-diy-eibach-pro-kit.html

Let me understand this, you are saying that since you lowered your car the ride is now smoother? Did you also change out the shocks and put in 'smoother' riding shocks too?