Straight from the HKS blog, the numbers and the bragging rights.
The HKS R33 with 1300ps @ 9000rpm, its best time was a 7.671 quarter mile at Highland Drag Race Way in 2001.
The HKS R32 with 950ps @ 9000rpm, its fastest time was 8.454 in 2002 at MMC Drag City
The HKS Drag Supra, complete tube frame with carbon fibre body. The car made a astonishing 1200ps. No times available
The illusive HKS Drag 180SX, it made 1185ps @ 9000rpm, also on this car I do not have any times.
Can you guys fill in the blanks?
Kultivate's Weblog 
HKS Drag Supra has 1479 bhp (1103 kW).
Best 1/4 mile time 6.893 at 193.13 MPH.
Best trap speed 6.956 ET at 199.37 MPH.
Sources:
http://www.mkiv.com/mkivregistry/of_interest/hks_drag_supra/index.html
http://www.hksusa.com/press/news_display.asp?id=2811
mkiv.supras.org.nz/articles/hpi15_2.htm
http://www.hks-power.co.jp/history/history2001.html
HKS Drag Supra has 1479 bhp (1103 kW).
Best 1/4 mile time 6.893 at 193.13 MPH.
Best trap speed 6.956 ET at 199.37 MPH.