Tornado's are a hoax, their theory is completly pointless in a fuel system where the fuel doesn't meet the incoming air until right before it goes into the chamber, and the chances of the air spinning the same way it did in the intake tube once it gets to the intake manifold (after it is divided into 4-8 seperate channels) is slim. I have also heard reports that they are so cheaply made they can actually turn sideways in the intake making a rather large obstruction which also does little to improve milage.
K&N's do have some merit, in that you don't have to replace them, you can just clean them. But if you don't do it properly you can muck up your MAF sensor and make your vehicle run poorly. They claim to flow 15% better than a stock paper filter... and on average it takes .3hp to pull air thru a paper one so that is how much you gain. They advertise that they filter better as they get dirtier, which I read as when they are clean they let more stuff by...
Best thing to do is to check your tire pressures, keep up on maintinance, take it easy on the skinny pedal, and drive the speed limit.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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