Tein makes the Tein S-Tech and H-Tech lowering springs. The S-Tech provide about a 2.2" drop while the H-Tech's provide about a 1.5" drop.

TEIN USA INC.9798 Firestone Blvd.
Downey, CA 90241
Phone: (562)861-9161
Fax: (562)861-9171
www.tein.com

Part#'s for the S-Tech:
Soft- SKH40-S1B00
Medium- SKH40-M1B00

JIC  offers the X-Magic lowering springs.
They are about $300 and lower the front and rear by 50mm (~2 inches).
http://www.jic-magic.co.jp/menu.html

Gialla has a set of lowering springs called high mode suspension that costs roughly the same as the JIC's and lowers it 50-45mm (~1.75-2 inches) front and back.
http://www.gialla.co.jp/gialla/index2.html

Trust sells down springs as well called the Dow Max.
Like Tein with their S and H-Tech springs. Trust sells town and low down springs.
the town springs lower the car by 15-20mm (~.5-.75 inches) while the low down springs lower the car by 45-50mm (~1.75-2 inches).
These are a bit more pricey compared to the 2 mentioned before.
http://www.trust-power.com/maxtune/dowmax/index.html

There is also RS*R Ti2000. These lower the car about 50mm (~2 inches) as well but costs around $500.
http://www.rs-r.co.jp/products/sus/ti2000/index.htm

- Info provided by souldoubt, hipermax_d, and hype of OdyClub.