Sorry guys, but your wrong. The eaton has twists to it, but it is not a twinscrew. the twists are simply so the flow of air is continuous and for less noise. they look simular but work totally different. Currious? look here:

http://www.lysholm.se/en/prod_eng.asp Lysholm has full patens on the twinscrew supercharger, thats their web site.

http://www.kennebell.net/techinfo/ge...romcatalog.pdf - thats a pdf file compairing the roots vs. the twinscrew.

-Jeff