Joff
Member
Registered: 17th Oct 00
Location: Cambridgeshire
User status: Offline
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It's swings and roundabouts where airfilters are concerned.
The VIS works well because the air that gets to the inlet manifold is as cool as it's going to get - air comes straight into the filter and doesn't get much of a chance to heat up along the carbon fibre.
Also, as the carbon fibre is one piece there's no weld or join to increase turbulence - the air will be laminar and happy 
The Viper works because you're basically redesigning the airbox - a sealed unit with a filter and a remote cold air feed.
Cold turbulent air comes in, then gets to the filter and is smoothed out by the Vipers reverse flow design.
Because the VIS is also essentially a long plenum chamber, there's a bit of air ready as soon as the throttle body wants it, whereas other filters will have to suck in each time.
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