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  2. K&N Engineering - Wikipedia

    en.wikipedia.org/wiki/K&N_Engineering

    K&N Engineering, Inc. (also known simply as K&N) is a manufacturer of air filters, cold air intake systems, oil filters, performance parts, and other related products. [1] K&N manufactures over 12,000 parts for various makes and models of cars, trucks, SUVs, motorcycles, ATVs, industrial applications and more.

  3. Harley-Davidson Sportster - Wikipedia

    en.wikipedia.org/wiki/Harley-Davidson_Sportster

    The Harley-Davidson Sportster is a line of motorcycles produced continuously since 1957 by Harley-Davidson. Sportster models are designated in Harley-Davidson's product code by beginning with "XL". In 1952, the predecessors to the Sportster, the Model K Sport and Sport Solo motorcycles, were introduced.

  4. Air filter - Wikipedia

    en.wikipedia.org/wiki/Air_filter

    In the early 20th century (about 1900 to 1930), water bath air cleaners were used in some applications (cars, trucks, tractors, and portable and stationary engines). They worked on roughly the same principles as oil bath air cleaners. For example, the original Fordson tractor had a water bath air cleaner. By the 1940s, oil bath designs had ...

  5. Butterworth filter - Wikipedia

    en.wikipedia.org/wiki/Butterworth_filter

    The Butterworth filter is a type of signal processing filter designed to have a frequency response that is as flat as possible in the passband. It is also referred to as a maximally flat magnitude filter. It was first described in 1930 by the British engineer and physicist Stephen Butterworth in his paper entitled "On the Theory of Filter ...

  6. Finite impulse response - Wikipedia

    en.wikipedia.org/wiki/Finite_impulse_response

    If the filter is a direct form FIR filter then is also a coefficient of the filter. This computation is also known as discrete convolution . The x [ n − i ] {\textstyle x[n-i]} in these terms are commonly referred to as tap s , based on the structure of a tapped delay line that in many implementations or block diagrams provides the delayed ...

  7. Wikipedia:WikiProject Abandoned Drafts/Stale drafts/Full/2 ...

    en.wikipedia.org/wiki/Wikipedia:WikiProject...

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