Car & Driver tested something like this... (archive)

...in April 1998, called the Tornado. They installed it on a long-term test BMW 540i, and determined that it didn't do anything at all. No change in horsepower, torque, or fuel economy.

heres the link http://www.spiralmax.com/
OK I found the magazine ad, so I went to the web page, started reading and thought, right!! its a piece of tin obstructing the air path, then I found these links to Mercedes, Infinity, .... swirl tech improvements, then these crazy Dyno charted testimonials,
36 hp in an 86 Sable,
28 hp in a Chevy 4.3 TBI.
some guy w/ a 325es claims 10-15%
two guys w/ Z3 1.9s claim 10hp.
What the F----
Has any one shelled out the dough for this just to see if its crap or not?
I'm having a tough time believing I could cut up a couple soupcan lids, shove 'em in my intake tube and get 20 hp in my 535is.
Douglas
87 535is 86k

Follow Ups:

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Questions, comments, or problems, please visit the Roadfly help desk.