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The EPA did a study proving that on fuel injected vehicles a clogged air filter will not affect fuel economy, it will only affect horsepower. A K&N won't improve your fuel economy anyway, the DIY warm air intake would be a much better route. Some people prefer filters like Spectre and K&N because they are reusable. However, if you hold them up to the light there are some areas where you can see right through them. Small holes, but still much much larger than the holes you'd find in a standard paper filter. If you plan on keeping the car long term, I'd recommend going with a standard paper filter or an Amsoil Nanofiber Air Filter. They have been proven to filter much better than K&N type filters. This will prevent as much dirt from getting in the cylinders and reduce cylinder wear and help maintain good compression longer.
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