Here is a quick reference for those looking to drop your car. I did my best to search manufacturer websites and aftermarket websites. Make sure you do your own research for drop heights and do not go by this. There is conflicting drop #'s depending on where you look. I found these to be the most accurate.

Brand Drop F/R Inches Spring Rate #'s F/R

Tanabe GF210 1.0 / 1.2 338/376
Tanabe NF210 1.2 / 1.2 324/366
Eibach Sportline 1.2 / 1.2
Eibach Prokit 1.0 / 1.0
Skunk2 1.3 / 1.0
Intrax 1.2 / 1.2
B & G S2 1.0 / 1.0
Hotchkis .58 / .75 310/350
H & R 1.5 / 1.5
Espelir GT 0.4 / 0.4
Progress 1.0 / 1.0
RS*R 0.6 / 0.6 358/434
Tenzo R 2.0 - 2.5
Tein H .28 / .16 ?? 360/370
Tein S .67 / .55 ?? 390/400
Cobb Tuning .75 / .90

 

Here is some more good info: Link