I've installed a ton of these on the 6g72 engines. They come with the adapter.

http://www.3sx.com/store/comersus_viewItem.asp?idProduct=1576

Until you hit 400HP they really don't work any better than a nice clean drop in unit. If you have a nasty old filter, I'd get a k&n drop in.

1992 VR4 12.5 @ 110 - SOLD
1993 Stealth RT/TT 11.4 @ 129 - SOLD
1991 VR4 9.2 @ 159 - Old Shop Car
1992 Stealth Twin Turbo ATX - SOLD
1990 Montero LS LWB - RIP
1995 Montero LS - RIP
1998 Montero
1992 Galant VR4 474/1000
2007 Prius