Check oout PG's web site for a full break down. He took care of me because the first one broke, even though I got it second hand.
I didn't get this one for free, but He gave me a very good deal.
330i ~ BMW Perf. Susp. ~ M3 Front susp ~ BMW Perf Exhaust ~ 3.38 lsd ~ SF71 Alf CSL reps ~ Continental Extreme DWs ~ AA Tune ~ WTB: e93 M3 Fron Sway Bar