If I remember correctly those should be ok with stock springs.
Here is a thread about changing the front struts.
zerothread/214767 Replacing the rear shocks is conceptually the same. You just have to get in the trunk to remove the top mount.
You will want to replace the strut bearings when replacing the front struts. You'll need to get them from a dealership. Call Joe and tell him you're a NICO member http://www.infinitipartsusa.co...id=55It would also be wise to replace the sway bar and end link bushings. Check out
http://www.suspension.com for Energy Suspension bushings(they make a noticeable difference).
To further improve handling get a front strut tower bar and a rear sway bar.