I have a 2006 Honda Civic. can I lower my car on the factory springs? If so how low can I go?? Thanks

 

no (not in a ghetto way)

you can buy after market springs that will drop it form a bit under an 1" all the way to 1.5"

 

I was thinking about buying Eibach Sportline (1.4"F & 1.4"R) I just don't know if I can put them on the factory Struts????

 

Yes you can put them on the factory shocks. You will be shortening the life of the factory shocks, but they will last for a while. I have sportlines with stock shocks and its been that way for over a year, still no problems. Then again I'm pretty easy on my suspension, I go very slow over dips, bumps, driveways, etc.
But don't just cut the factory springs.

 

Just buy the HFP suspension. It will drop your car about an inch and you can get the set up cheap threw http://www.collegehillshonda.com/parts/.