Ah my bad. Yeah that would be on the shorter end of the drops then. I think Eibach goes a bit further then(1.7 and 1.8" or something). Both are really well designed solutions, and you will not hear anything bad about either.
for reference:
Swift Springs USA
Just throwing my two cents out there, if I was going to go for a easy suspension upgrade, I would rather spend 1900.00 on swifts and koni sports than 1 way coilovers. Even the good 1-ways like KW v1 are still in the 1500.00 range and they don't use a true type in the back.
I'm sure coilovers for street use on the rear are OK, but for track use there is some potential problems for mounting them on that unreinforced tower. In most of the competitions out here mounting to anything other than OEM tower bumps you into modified or unlimited class.