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I have a K&N Powerhaus intake on my 911. It's nice, but don't expect the wild power gains promised. A friend of mine had his car rolling road tested before and after a K&N conversion. Result: Plus 6 horsepower at the wheels. You need to place the filter so that cold air is lead to it. Also you can get some kind of heat resistent "foil" or whatever you call that in english. Install that around the filter and it gets better.
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