They seem to believe in a similar device down-under. At least the manufacturer's ad believes in it! Found this in "4x4 Australia Magazine" http://www.hicloneqld.com/
"Hiclone is a simple maintenance-free device, which fits inside the air filter housing of a carburettor or in the air induction hose on EFI, turbo, LPG or diesel engines. Hiclone has no moving parts and is made from stainless steel, so it will last a lifetime. Hiclone has an unconditional money back guarantee.
Hiclone simply changes the flow of air through the air induction system. Hiclones special fins create a swirling effect, this optimises flow through the air intake system and improves fuel-air mixing to allow near-complete combustion. Just think of how nature produces its most efficient flow rates, invert a bottle or empty the sink and nature will show you how Hiclone works.
... we generally gain between 10 to 20% better fuel efficiency, but with two Hiclones we generally gain over 20%%
We have found that with one Hiclone we generally gain between 10 to 20 per cent better fuel efficiency, but with two Hiclones we generally gain over 20 per cent fuel efficiency. A pre-turbo Hiclone will bring the turbo on up to 600 rpm earlier.
Elsewhere in their liteature they say that installing one post turbo helps also. Hmmm. Smells like snake oil, seems like some wild claims.
This is a whole different principle from the TAG. The TAG straightens the incomming air into the compressor, this Hiclone swrils the air "as seen on TV" Billy Mays, shamwow, on and on.
"10 to 20 % and over better fuel efficiency" dream on.
The TAG on my truck netted me 5% increase in MPG, 22 MPG X 5% = 23 MPG
