The "helix effect" of Mr. Willhite's aluminum spacer sounds similar to the claims made for the tornadoair unit.
I dunno, I've never used either one. If you're interested, the following URL's will get you to the tornadoair web site and to the comments of a SAAB owner who tried the unit in his car.
http://www.tornadoair.com/
http://members.aol.com/TxSaabClub/Tornadoair.html
Don
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