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Waaaaaaay back, K&N ruled the modding scene 'cause OE filters were lame and engines suffered from strangulation.
No more. OE filters are of very high quality today, and in terms of overall operating costs, cheap. Modern engines experience little or no benefit from having the intake alone opened up, the downside of potentially ruining expensive emissions and FI components outweighs any gain you might see.
20 years ago many 750SS racers simply left the intake horns on their flat-slide carbs open. During the short race, the odds of sucking something in were low, and the need to have as much as air flowing as possible was high. The only guys running K&N filters were those being paid to. On the street, many of us with modified bikes ran K&N's because the stock airboxes were either too small or did not fit bigger carbs.
The drag racing scene was similar. I couldn't make the OE filter work with my roller small block, meaning a K&N was pretty much the only option.
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