I have a 2010 LT2. I purchased a set of what I were told are FE3 struts n springs from a member on here with a 2.4L. When installing them they didnt seem to be much different, the strut looked identical and the new springs looked VERY slightly bigger. Now after having them installed I noticed the ride height stayed the exact same, well actually the front went up a little
After taking it for a drive it almost felt like it was a bit stiffer, but not real noticably. Almost felt like i just installed a brand new set of struts and thats it.

 

well going from fe1 to fe2 is very little change, that stiffness increase is all it did/will do.