Yes, they're a bit late but Tanabe finally has lowering springs for the 05 STi:

The GF210 coil spring is geared towards maximum performance, without compromising daily driveability. A subtle drop provides an aggressive stance, while the higher spring rates (+20% - 30% over stock) provide excellent handling and vehicle stability characteristics. These springs provide a very noticeable gain in performance when installed.

The GF210 is well mated with a performance shock upgrade to extract the full potential of the coil spring, but will also work with factory equipment.

This will lower your STi 1" F / .5" R.

http://www.gruppe-s.com/Subaru/subsus/tnb_gf210.jpg

$245 Shipped!!!
$395 Installed!!!

Thanks,

Geoff
geoff@gruppe-s.com

People,

We sorry to announce that we just sold our last set of these springs. When we contacted Tanabe to order more, we were told that they're backordered until November! Again, we apologize for any inconvenience; you can still order these springs but it will be a bit before we have them again.

Thanks,

Geoff