The heavy duty filters that are available locally are the:
Mobil 1 Extended Performance
- Short M1-108
- Long M1-110
K&N
- Short HP-1008
- Long HP-1010
The M1 uses synthetic fibers in the filtration layer, don't have any data on the construction of the K&N but the weight feels roughly the same as the M1 indicating a similar amount of filter media. They are both are about twice as heavy as the Puralator Pure One which is the top of the line paper based filter.
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